mFi Mason-Lite MFPST43 User manual

Inc.
Instructions
Masonry Firebox
Model MFPST43
▲
!WARNING: THIS FIREPLACE IS APPROVED FOR USE AS A WOOD BURNING FIREPLACE.
IT HAS NOT BEEN TESTED OR APPROVED FOR UNVENTED GAS LOGS.
ê
! WARNING: IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE CAN
CAUSE INJURY, PROPERTY DAMAGE OR LOSS OF LIFE. REFER TO THIS MANUAL FOR ASSISTANCE OR
ADDITIONAL INFORMATION. CONSULT A QUALIFIED INSTALLER OR LOCAL DISTRIBUTOR.
SAVE THIS BOOK
This book is valuable. In addition to instructing you on how to install and maintain your appliance, it also contains
information that will enable you to obtain replacement parts or accessory items when needed. Keep with your other
important papers.
Do not store gasoline or other ammable vapors and
liquids in the vicinity of this or any other appliance.
RV 1/6/21
ICC Evaluation Services
Report No. 2401
FOR BEST RESULTS, IT IS
HIGHLY RECOMMENDED THAT A
POWER VENT SYSTEM BE
INSTALLED
(NOT INCLUDED)
THIS WOOD-BURNING FIREPLACE COMPLIES WITH STANDARDS UL127 AND ULC610 AS A FACTORY-
BUILT APPLIANCE.
PFPFSS
®
USUSCC
File Number: F08-154

1
CONTENTSCONTENTS
Below is a sample picture of the rating plate that is located inside the lower dome side of your replace.
Serial number and date code should be stamped on the plate where required.
Fireplace is designed for installation per the National Fire Protection Association Standard
for Chimneys, Fireplaces, Vents and Solid Fuel-Burning Appliances (NFPA 211).
P/N MFP416_rev 13_MAY 2018
MODEL
No.:
MFPST43
MANTEL CLEARANCES
0” - 3” : 1-1/2” MAX. PROJ.
3“ - 12” : 1-1/2“ - 8” MAX. PROJ.
DO NOT REMOVE THIS LABEL
See MFI’s installation and operating instructions for
this model. Contact local building officials about
restrictions and installation specifications in your area.
THIS APPLIANCE NEEDS FRESH AIR FOR SAFE OPERATION AND MUST BE INSTALLED
SO THERE ARE PROVISIONS FOR ADEQUATE COMBUSTION AND VENTILATION AIR.
WARNING: THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED GAS LOG SET.
TO REDUCE THE RISK OF FIRE OR INJURY, DO NOT INSTALL AN UNVENTED GAS LOG SET INTO FIREPLACE.
!
MANTEL ABOVE OPENING:
MIN. - 3” SHEATHING OR TRIM
TO OPENING SIDES - 8”
WARNING: DO NOT BURN WITHOUT
FIREBRICK LINING. FIREBRICK NEEDS
TO BE RATED ASTM-C1261.
WARNING:
THIS FIREPLACE HAS BEEN TESTED FOR USE ONLY
WITH APPROVED GLASS DOORS. TO REDUCE THE
RISK OF FIRE OR INJURY, CONSULT OWNER’S MANUAL.
!
THIS FIREPLACE IS DESIGNED FOR USE
ONLY WITH SOLID WOOD LOGS, PLUMBED
LPG OR NG LOG LIGHTERS OR PLUMBED ANSI
Z21.60 DECORATIVE GAS LOGS.
Consult instructions included with this fireplace for
further information.
DATE OF MFG. SERIAL No.
FIREPLACE CLEARANCES TO COMBUSTIBLES:
UNIT FRONT, SIDES, REAR.............................................2” (51 mm)
COMBUSTIBLE FLOOR....................................................8” (203 mm)
COMBUSTIBLE SHEATHING ABOVE OPENING TOP...18” (457 mm)
SHEATHING OR TRIM TO OPENING SIDES...................8” (203 mm)
MANTLE ABOVE OPENING...........................................12” (305 mm)
OPENING TO SIDE WALL..............................................24” (610 mm)
HEARTH EXTENSION BEYOND FRONT.......................20” (508 mm)
HEARTH EXTENSION BEYOND SIDES........................12” (305 mm)
INSULATION FROM FIREBOX.........................................2” (51 mm)
WARNING:
Use only approved, listed
UL103-16” I.D. Class A
Chimney System.
Please refer to pipe mfg.
installation instructions.
Chimney Height:
Max.: 40 ft.
Min.: 14 ft.
(17 ft. with 1 or 2 offset
sections maximum)
!
Report
No. 08-154
MFI
Masonry
Fireplace
Industries, LLC
6391 Jurupa Ave.
Riverside, CA 92514
PFS
®
USC
6. HOLES: 4x Ø0.14 THRU
5. BOXES TO BE STAMPED DURING MANUFACTURE.
4. LARGE TEXT TO BOLD UPPERCASE ARIAL, 10 PT. MIN. (AS SHOWN).
3. SMALLEST TEXT TO BE ARIAL, 8 PT. MIN (AS SHOWN).
2. ALL TEXT AND GRAPHICS TO BE CLEAR ALUMINUM ON A CONTRASTING, BLACK BACKGROUND.
1. MATERIAL: CLASS IIIA , .020 THICK ALUMINUM RATED AT 302°F (150°C).
NOTES: UNLESS OTHERWISE SPECIFIED
DESCRIPTION: LABEL, RATING, MFPST43
P/N: MFP416
REV: 13
DATE: 05/01/2018
LAST MODIFIED BY: CB
Doc File Name: MFP416_RATING PLATE, MFPST43 rev13.ai
LISTED MASONRY FIREPLACE SYSTEM COMPLIES WITH APPLICABLE REQUIREMENTS OF UL127 AND ULC610.
4.25” 4.00”
6.5”
6.25”
.12”
MFPST-43 Fireplace Parts Diagrams............................................................................................................................................................2
Combustible Floor Systems...........................................................................................................................................................................2
Non-Combustible Floor Systems...................................................................................................................................................................2
MFPST-43 Fireplace Parts List......................................................................................................................................................................3
MFPST-43 Fireplace Overall Dimensions .....................................................................................................................................................4
Fireplace Framing Dimensions......................................................................................................................................................................4
Fireplace Framing Dimensions (Combustible Floor Systems) ......................................................................................................................5
Safety Information .........................................................................................................................................................................................6
Product Overview ..........................................................................................................................................................................................7
Clearances to Combustibles..........................................................................................................................................................................8
Combustible Floor Clearances ......................................................................................................................................................................8
Mason-Lite Fireplace & Chimney System .....................................................................................................................................................8
Chimney System Heights ..............................................................................................................................................................................8
Supporting Floor Systems .............................................................................................................................................................................9
Combustible Floor Installations .....................................................................................................................................................................11
What You Will Need.......................................................................................................................................................................................11
Field Assembly Procedures ..........................................................................................................................................................................12
MFPST-43 Fireplace Assembly .....................................................................................................................................................................12
Fireplace Finishes & Combustible Trim Clearances......................................................................................................................................16
Mantle and Mantle Shelf Clearances ............................................................................................................................................................16
Installing Outside Combustion (make-up) Air ................................................................................................................................................16
Adding a Gas Pipe.........................................................................................................................................................................................16
Adding Electrical Connection.........................................................................................................................................................................16
MASON-LITE Chimney Systems:..................................................................................................................................................................17
Installing Damper and Chimney System .......................................................................................................................................................17
Finishing Your Installation..............................................................................................................................................................................17
Fireplace Door Accessory..............................................................................................................................................................................17
Mason-Lite Owner’s Operation & Precautions ..............................................................................................................................................18
Starting a Fire and Basic Operation ..............................................................................................................................................................18
ANNUAL FIREPLACE MAINTENANCE........................................................................................................................................................19
SURFACE CRACKS......................................................................................................................................................................................19
CUSTOMER SERVICE & PARTS REPLACEMENT:.....................................................................................................................................19
Appendix I......................................................................................................................................................................................................20
Appendix II.....................................................................................................................................................................................................21
Lifetime Limited Warranty..............................................................................................................................................................................22

2
MFPST43 Fireplace Parts DiagramsMFPST43 Fireplace Parts Diagrams
Combustible Floor System PartsCombustible Floor System Parts
Fireplace Parts DiagramFireplace Parts Diagram
10
11
9
5
6
4
7
8
12
2
1
14
3
13
17
18
19
Figure 1
Figure 2
16
15

3
MFPST43 Fireplace Parts ListMFPST43 Fireplace Parts List
LEGEND:
N/S = NOT SUPPLIED.
(CAN BE OBTAINED FROM YOUR LOCAL HARDWARE STORE)
OPTIONAL DOORS:
ONLY CROWN-BRECKINRIDGE OR MCKENZIE-PENDELTON
DOORS HAVE BEEN TESTED AND APPROVED FOR USE WITH
THIS FIREPLACE.
MFPST43-ARC
Optional Arch Kit
ITEM DESCRIPTION QTY
1 HEARTH (Left or Right) 2
2 SIDE WALL WITH OUTSIDE AIR KIT ACCESS Ø4” HOLE 1
3 SIDE WALL 7
4 LOWER SIDE DOME 2
5 LINTEL 2
6 LOWER DOME FRONT 2
7 53 X4 X 3 X 1/4 ANGLE IRON 2
8 SPILL SWITCH BAFFLE 2
9 UPPER SIDE DOME 2
10 UPPER DOME FRONT 2
11 DOME TOP 1
12 SPILL SWITCH 2
13 RATING PLATE 1
14 #3 REBAR (Ø3/8”) x 36” 4
15 Ø16” DAMPER / ANCHOR PLATE 1
16 INSULATION BLANKET N/S
PARTS BELOW ARE FOR COMBUSTIBLE FLOOR SYSTEMS
17 CEMENT BOARD N/S
18 STEEL SUPPORT PLATFORM 8 INCH HIGH 1
19 ASSY, FLOOR JOIST BRACE 4
Optional Outside Ø4”
Combustion Air Kit
Model No.: MFPST-AK
(Ø4” Ducting not included)

4
MFPST43 Fireplace Overall DimensionsMFPST43 Fireplace Overall Dimensions
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! WARNING
Failure to position the parts in accordance with these diagrams or failure to use only parts specically
approved with this appliance may result in property damage or personal injury.
62 1/4"
43 1/4"
53"
A
A
16 1/8"
3"
32"
28"
2 1/4"
23 1/2"
SECTION
A-A
Figure 3
Overall Dimensions
28"
57"
I.D.
FRAMING
18" MIN*
2" MIN
2" MIN
2" MIN
20"
MIN
2" MIN
12" MIN
57" I.D.
FRAMING
8 1/2"
2" MIN
2" MIN**
Non-Combustible Floor Systems
Figure 4
IF WOOD FRAMING IS UTILIZED
IT MUST BE HELD 18 INCHES
MIN. FROM TOP OF LINTEL AND
2 INCHES MIN.CLEARANCE
MUST BE MAINTAINED ALL
AROUND FIREPLACE DOME.
IF METAL FRAMING IS USED
MAINTAIN A 1/2 INCH MIN. AIR
SPACE FROM TOP OF LINTEL.
2” MIN. CLEARANCE TO
COMBUSTIBLES AROUND SIDES,
REAR AND TOP OF FIREPLACE DOME.
MAINTAIN THE 2” CLEARANCE TO
COMBUSTIBLES ABOVE THE DOME.
DO NOT ATTACH COMBUSTIBLE
MATERIALS ON TOP OF THE DOME.
Fireplace Framing DimensionsFireplace Framing Dimensions

5
Fireplace Framing Dimensions (Combustible Floor Systems)Fireplace Framing Dimensions (Combustible Floor Systems)
28"
57"
I.D.
FRAMING
18" MIN*
2" MIN
2" MIN
2" MIN
20"
MIN
2" MIN
12" MIN
57" I.D.
FRAMING
8 1/2"
2" MIN
2" MIN**
2 INCH MIN CLEARANCE TO COMBUSTIBLES BOTH
SIDES OF FIREPLACE
** If using a raised hearth or metal base plate, note that a
combustible wood header must be no closer than 2” to the top of
the dome top.
Figure 5 - Combustible Floor
28"
57"
I.D.
FRAMING
18" MIN*
2" MIN
2" MIN
2" MIN
20"
MIN
2" MIN
12" MIN
57" I.D.
FRAMING
8 1/2"
2" MIN
2" MIN**
* Not provided as part of replace
Figure 6 - Non-Combustible Hearth Extension (by others*)
1/2" THICK
CONCRETE
BOARD
CLASS "A"
CHIMNEY
SEE FIG.
29 AND 30
SEE FIG. 27
2" AIRSPACE
CLEARANCE TO
COMBUSTIBLES
ON REAR AND
SIDES OF UNIT.
ONLY NON-COMBUSTIBLE
MATERIAL WITHIN 18” OF
TOP OF OPENING.
28”
8” METAL
PLATFORM
1/2”
2”
Figure 7 - Combustible Floor

6
Safety InformationSafety Information
GUIDELINES FOR USE:
All current and future users of Mason-Lite Fireplaces
are charged with the responsibility for full knowledge of the
information contained within this manual which includes:
Strict requirements for assembly.
Detailed instructions for installation.
Cautionary guidelines for use.
On-going maintenance instructions.
It is the responsibility of the distributor, subcontractor and/
or the general contractor – whoever shoulders the liability
for installation of this product – to see to it that the work is
in complete compliance with the guidelines and instructions
in this manual. Note that the general contractor is the party
accountable for seeing that adequate clearances are provided
from all rebox surfaces per specications in this manual.
DO NOT USE A FIREPLACE INSERT OR OTHER
PRODUCTS NOT SPECIFIED FOR USE WITH THIS
FIREPLACE.
The Mason-Lite is Designed for Use Only with:
- Solid Wood Logs
- Plumbed LPG or Natural Gas Log Lighter.
- Plumbed ANSI Z21.60 Decorative Gas Log.
DO NOT USE OR STORE GASOLINE OR OTHER
FLAMMABLE LIQUIDS OR GASES IN OR NEAR THE
FIREPLACE!
ATTENTION: A re or an explosion could occur causing
property damage, injury or loss of life if you do not follow the
information in this manual!
NOTE: THIS MANUAL MUST BE REPRODUCED ONLY
IN ITS ENTIRETY.
Before Beginning the Installation
Read these instructions carefully before beginning the
installation of this replace. Also, if installing an ANSI Z21.60
Decorative Gas Log, read the gas log appliance manufacturer’s
literature regarding sizing and suitability for the installation into
this Enclosure prior to installation.
Statement of Intended Use:
The Mason-Lite Masonry Fireplace is a modular refractory
masonry unit designed for eld assembly. The rebox is
constructed using pre-cast, interlocking refractory blocks.
The blocks are then secured to each other using Mortar. The
system includes all parts necessary for the assembly of a
complete masonry replace. In addition to the basic enclosure,
a standard 1-1/8” thick, high temperature refractory brick is
required to line the interior of the rebox.
These replaces are not intended to serve as a primary
heat source, rather, the replace was expressly created as a
supplemental source of heat. The unit is designed for use with
solid fuels such as cord wood.
WARNING:
Any application other than the “Intended Use” as stated above
is in violation of the manufacturer’s instructions and is hereby
prohibited. Such violation may cause immediate hazard,
property damage or loss of life and will void all liabilities to the
manufacturer and will void all warranties explicit or implied.
WARNING: THIS FIREPLACE HAS NOT BEEN TESTED
FOR USE WITH AN UNVENTED GAS LOG SET. TO
REDUCE THE RISK OF FIRE OR INJURY, DO NOT
INSTALL AN UNVENTED GAS LOG SET INTO FIRE-
PLACE.
WARNING: THIS FIREPLACE HAS BEEN TESTED FOR
USE WITH OPTIONAL GLASS DOORS: CROWN-
BRECKINRIDGE OR MCKENZIE-PENDELTON ONLY.
WARNING:
Install only approved, listed UL 103-16” I.D. Class A
Chimney System.
Chimney maximum height: 40 feet
Chimney minimum height: 14 feet (with o󰀨set = 17 feet)
2 o󰀨sets maximum.
Important: Follow the chimney pipe manufacturer’s
instructions on the installation of their specic ue system.

7
Introduction
We extend a warm welcome from all of us at Masonry
Fireplace Industries,Inc.(MFI), proud manufacturers of Mason-
Lite Fireplaces. Thank you for choosing MFI.
You may have thought long and hard before you chose the
replace which would grace your home. Rest assured that
every component of the Fireplace has been tested to ensure
long-term durability.
Product Overview
Mason-Lite Fireplaces are designed as factory-built blocks
to be assembled on-site. These replaces may be installed
on either combustible or non-combustible oors. In order for
the replace to be installed on a combustible oor though, it
is necessary that the replace be supported on a platform or
sub-oor that is non-combustible.
The Four Components of the Mason-Lite Fireplace:
• Combustible or Non-Combustible Floor
• Non-Combustible Raised Platform
• MASON-LITE Firebox and Smoke Dome
• UL103-16” class A listed chimney system required.
Important: Follow the chimney pipe manufacturer’s
instructions on the installation of their specic ue system.
Careful step-by-step instructions for each phase of
the installation procedure will be given for the Mason-Lite
conventional radiant heat replaces. Those instructions
generally fall into the following categories:
• Spacing and clearance as it relates to combustible materials.
• Familiarity of installation for all components.
• The strength of the oor on which it rests.
• Chimney system measurements.
• Choice of materials and craftsmanship in replace and
hearth nishing.
Note that each of these topics will be covered in detail and that
the installer is expected to understand each phase completely
before going on to subsequent instructions.
Attention: Be advised that all the illustrations in this manual
are for general reference only. Do not scale drawings. Actual
design elements will vary from case to case. Pay attention to
specied minimum clearances to combustibles.
Testing and listing for the Mason-Lite Fireplace has been un-
dertaken by PFS Inc. (Report No. 08-154) to UL 127.
Attention: You may need a residential building permit to in-
stall a Mason-Lite Fireplace. Consult local jurisdictions before
you get started!
If asked, advise the local authorities that the Mason-Lite
Fireplace is designed for installation per the National Fire Pro-
tection Association Standard for Chimneys, Fireplaces, Vents
and Solid Fuel-Burning Appliances (NFPA211).
When choosing the location of your Mason-Lite Fireplace,
keep in mind you must maintain 2” (two inches) minimum
clearance from left, right and rear of Fireplace to surrounding
structure. Also, when choosing a location, consider outside air
requirements to determine if it will be on the left or right side of
the Fireplace. In the case of an island installation, outside air
accessibility may be obtained through sub-ooring. See
section on Installing Outside Air on page 17.
Figure 8 - Typical Installations
Internal
Wall
Installation
Island
Installation
Outside Air supply
from side wall or
crawlspace
Outside Air supply
from crawlspace
Product OverviewProduct Overview

8
Clearances to CombustiblesClearances to Combustibles
The distance to be maintained from the surfaces of the
replace to combustibles must be observed. Below is a list of
the most common combustible materials to name a few:
Drywall Wood ooring Plywood
Sub-ooring Wood Framing Particle board
Mill board Plywood paneling
Maintain the following clearances:
• Unit front, sides, rear: 2” (51 mm)
• Combustible Floor: 8” (203 mm)
• Combustible Sheathing above opening top: 18” (457 mm)
• Sheathing or trim to opening sides: 8” (203 mm)
• Mantel above opening: (refer to Fig.9)
• Opening to sidewall: 24” (609 mm)
• Hearth extension beyond front: 20” (508 mm)
• Hearth extension beyond sides: 12” (305 mm)
• Insulation from rebox: 2” (51 mm)
16"
10"
NON-COMBUSTIBLE
ONLY ZONE
18"
20"
22"
1 1/2"
3"
6"
8"
10"
SAFE ZONE FOR
PROJECTION OF
COMBUSTIBLE
MATERIAL
TOP OF FIREPLACE OPENING
MANTEL
LINTEL
FRONT
FIREPLACE
DOME TOP
Figure 9
Understanding Clearance to Combustibles
There is a build-up of considerable amount of radiant heat
on the outer surfaces of the Mason-Lite Fireplace. It’s critical
that proper clearances to combustibles be maintained so that
this radiant heat is maintained to safe limits.
Combustible Floor ClearancesCombustible Floor Clearances
MFPST-43 Mason-Lite Fireplaces have been designed with
clearance to combustible oors at a minimum of 8-1/2” (eight
and one half inches) as provided by the 8” metal base and
1/2” concrete board. Cover any part of the combustible oor
system left exposed with 1” (one inch) thick ceramic ber
insulation rated up to 2,100°F.
The Mason-Lite Steel Platform , the 1/2” concrete board
above, the 1” ceramic ber blanket or board within the
platform (Fig.15) and the 2” clearance for dome front, and unit
sides provide the temperature safety margin to combustible
materials.
Mason-Lite Fireplace & Chimney SystemMason-Lite Fireplace & Chimney System
Prior to starting the installation, check with local, regional or
state codes for any restrictions or required permits regarding
your replace installation.
1) The Mason-Lite is designed to be installed with a listed
UL-103-16” I.D. Class A, Metal Chimney System.
2) This Mason-Lite replace is intended as a supplemental
heat source only. It is not intended as a primary heat
source.
3) It is the responsibility of the contractor installer (not the
manufacturer) to ensure that adequate combustion air is
provided for proper function of this replace. Fireplaces
take up a large volume of replacement air from outside the
house and if the house is of airtight construction, smoke
spillage may occur if proper draft is not achieved.
4) There are many conditions beyond a manufacturer’s
control regarding improper replace operation. The
manufacturer cannot ensure “smoke free” operation,
nor can the manufacturer take on the responsibility for
problems with surrounding construction; chimneys that
have not been built at the right heights; system drafts
caused by faulty mechanical systems; adverse weather
conditions or any other inclement environmental situations
over which the manufacturer has no control.
5) Inspect all replace & chimney components for evidence
of damage prior to starting installation. Consult your local
distributor for replacement parts if necessary.
6) Under no circumstances should you make any adjustments
or modications to the chimney system during the
installation procedure. If you do, you are not only liable
for negating the warranty, but you could very well cause a
serious malfunction of the replace. You must follow your
chimney manufacturer’s instructions.
7) Caution is urged if it is decided to add insulation material
to any part of the Mason-Lite Fireplace or Chimney
system, be certain that the insulation material is kept at
least 2” (two inches) away from any part of the system.
When using insulation or vapor barrier materials, cover
with a layer of plywood, particle board or gypsum board to
maintain the specied 2” (two inch) clearance.
8) Air spaces around rebox must remain open. DO NOT ll
these open spaces with insulation or packing material of
any kind.
Chimney System HeightsChimney System Heights
When installed, the maximum overall height of the chimney
system from bottom of replace to the top/termination chimney
is 40 feet. The minimum installed height of the completed
Chimney System is 14 feet with a straight ue stack, 17 feet if
the chimney includes one or two o󰀨set sections.

9
Supporting Floor SystemsSupporting Floor Systems
It is the ultimate responsibility of the installer to ensure that
proper concrete slab supports are used.
WARNING to the licensed design professional and/or building
contractor: It is your responsibility to be certain that the
Mason-Lite can be properly supported by the combustible
oor system on which the replace will rest.
For replace support foundations installed on concrete refer
to Appendix I and II (pages 20 & 21 ) for specic instructions.
Rebar locations
Lay-out the position of the replace and drill holes where
the rebar will be located. Secure eight #3 rebar 4 inches into
concrete foundation with ITW Epoxy or Simpson Epoxy.
Follow manufacturer’s instructions for installation of rebar into
slab.
Wood Floor
Anchorage of replace to wood oor construction is required.
Refer to Figure 10 for anchorage locations. Four anchors are
required to attach to the sub-ooring framing.
Crawl Space or Upper Floor:
For installation of rebox over combustible crawl spaces or
upper oors, anchorage of the rebox is required. Illustrations
of examples of possible anchorage methods are shown in
Figures 10 thru 13 depending upon the type of oor framing.
Final method of anchorage to be determined by licensed
design professional.
For conventional framing where the oor joists are parallel
with the sides of the rebox, the addition of oor joists to align
with the anchor brackets allows the brackets to be directly
connected to the oor joists.
Note that additional oor joists may be required to support
the weight of the rebox and chimney. Where the oor joists
run parallel to the front of the rebox, anchorage can be
accomplished in like manner as shown in Figure 12 using
blocking between the oor joist.
For oors supported by I-Joists, the method of anchorage
is illustrated in Figures 10 and 11. Figure 12 illustrates the
general arrangement of anchorage to oor framing.
It is important to take into consideration that the load for
the Mason-Lite Fireplace must be considered as additional
dead load that will have to be supported by the oor framing.
Additional oor joists or I-joists may be required as determined
by the licensed design professional.
The weights to be considered are noted in Table I. It is the
task and responsibility of the general contractor/installer to see
that the proper reinforcement for weight loads are made by a
licensed design professional prior to the replace installation.
As stated above, it is desirable to place additional framing
for alignment of anchor rods. Refer to Figure 14 for anchor
rod locations.
Attach the rebox side wall anchors to steel support frame
by inserting all-thread rods through holes on the bottom ange
on the steel support frame as shown in Figure 14. Secure with
two Ø 2” o.d. x Ø 9/16” i.d. x 0.10” Washers and two 1/2-13
UNC Nuts.
Figure 10
Floor Sheathing
not shown for
clarity
Metal Base
Assembly
EXAMPLE ONLY
2X FLOOR JOIST
2X FLOOR JOIST
A35 Brackets
(16 required)
I-JOISTS
Anchor
Brackets
Figure 12
I-Joist
Anchoring
Bottom
View
Example Only
I-Joist
Simpson
Strong-Tie
A-35 or
equivalent
Figure 11
I-Joist Anchoring
Top View
Example Only

10
MASON-LITE Weight Determination
The following are dead load weight estimates for the
Mason-Lite Fireplace.
Table I
Model: MFPST43
Fireplace 1,606 lbs.
Damper/Anchor
Plate, Firebrick &
Mortar
350 lbs.
Steel Platform 70 lb..
Floor Area 53” x 28”
(10.3 square feet)
Other Weight Considerations:
1) Fireplace nished facing (surround): This information needs to be obtained from the contractor.
2) Weight of metal ue: See chimney manufacturer’s weight specications. Some chimney systems can weigh up to 50 lb. per
linear foot.
Table II - Deection Limits
Construction L S or W D +L1
Floor Members I/360 --- I/240
1For wood structural members having a moisture content of less than 16 per cent at time of installation and used under dry
conditions, the deection resulting from L + 0.5D is permitted to be substituted for the deection resulting from L + D.
Note that MASON-LITE cannot accept responsibility for structural oor support details. All drawings are presented as mere
illustrations to indicate the presence of the underlying oor system. It is the responsibility of the general contractor/installer to
consult with a local licensed design professional for guidance in building a proper oor support system.
2” min
clearance Fireplace
outline
11”
Typical Anchorage
Layout
EXAMPLE ONLY
SECTION VIEW
ROTATED 90CW
Figure 16
Figure 15
48 3/4"
Figure 14
Floor framing anchor rods see Figure 15 for support of
anchor rods by the steel support frames.
11”

11
Combustible Floor InstallationsCombustible Floor Installations
8” Metal Base
The Mason-Lite Metal Base ensures the minimum 8” (eight
inch) clearance above combustible ooring is maintained.
A layer of 1/2” minimum Concrete Board is required on
the top and mid section below as shown in Figure 17. The
required sizes are shown in the table below.
1/2” Thick Cement Board Dimensions
Model A1 A2 B1 B2
MFPST-43 53” 28” 48” 23”
Figure 17 MFPST43 Metal Base Assembly
26 ga. galv.
Hearth Ember
Shields
Anchor Bracket All-Thread Rods are secured to the bottom ange
of the Metal Base with eight (8) at washers and eight (8) Nuts.
Place ber blanket
underneath base
Four (4) All-Thread Rods
are secured to the top
ange of the Metal Base
with eight (8) at washers
and eight (8) Nuts.
53”
28”
▲
!
IMPORTANT:
Remember to tighten up nuts below the oor after replace
installation in order to take up any slack in the threads.
Hearth Ember Shield:
Metal safety stripping is required between the front of the
Fireplace Hearth and Hearth Extension (not supplied). A 26
gauge galvanized 4” wide metal strip can be used. The length
needs to extend 2 inches beyond each side of the replace
opening. If two strips are used, make sure they overlap at
least two inches in the middle. The strip is placed about 2” into
the underside of the platform at the front of both openings on
the replace.
Note: When using an on-site-constructed hearth extension,
you may use a sand-cement grout between the hearth and
extension instead.
What You Will NeedWhat You Will Need
You will nd that the MASON-LITE Fireplace is designed
to be completely assembled on-site, consisting of interlocking
precast parts. You will need a thin-set type mortar for bonding.
The parts of the replace are made of Mason-Lite’s incredibly
strong blend of specialty cement and a light weight aggregate.
IMPORTANT! When applying mortar, it is imperative that the
concrete blocks be maintained moist (not soaking) so they
don’t absorb the water out of the mortar and cause adhesion
to fail. Frequently run a damp sponge to the parts before
mortar is applied!
The installation of an anchor plate/damper is required
but not supplied. You may purchase it from any chimney
manufacturer or MFI. Also, an optional combustion air inlet
MFP4-AK can be obtained from MFI.
Refractory Firebrick Liners also need to be installed. These
should be a minimum of 1-1/8” (one and one-eight inches)
thick. The liner will be applied within the walls and hearth area
of the rebox.
Materials needed for concrete slab
(non- combustible) installation
• Eight (8) pieces 3/8” rebar x 36” long (included with unit)
• Eight (8) pieces of rebar x 12” long (included with unit)
• Epoxy for securing rebar in footing / foundation
• Three (3) - 90 lb. bags of ready mix concrete with 1/4” or
smaller aggregate
• Mason-Lite Mortar (one 50 lb. bag)
Materials needed for combustible
wood floor installation:
• Eight (8) pieces 3/8” rebar x 36” long (included with unit)
• Eight (8) 12” long, 1/2-13 UNC All-Thread with (24) nuts
and washers
• 8 inch Metal Base.
• 1” ceramic ber blanket the size of the hearth base to go
under the metal base.
• ½” cement boards.
• Four or more fasteners to attach metal base to oor joists
• Mason-Lite Mortar (at least one 50 lb. bag)
• Three (3) - 90 lb. bags of ready mix concrete with 1/4” or
smaller aggregate.
Tools needed for both above installations:
• One 4’ level
• Roto-hammer with ½” drill bit (needed for concrete slab
install only)
• Drill motor with mixer blade (to mix Mason-Lite Mortar)
• Two empty 5 gallon buckets (to mix Mason-Lite Mortar)
• One wheelbarrow and shovel to mix concrete.
• Grout bag
• Triangular masonry trowel
• Rubber hammer
• Sponge and water bucket to wipe down and moisten parts
prior to applying mortar.

12
1) Place the Mason-Lite Fireplace hearth base on top of your
non-combustible oor or metal base. For concrete slabs,
supporting oor needs to be rated at ASTM 90.
2) a) Combustible Floor Installations:
Mix up a batch of mortar and place hearth slabs on
top of cement board which sits on top of the Raised
Metal Platform (see Figure 18). All-thread rods should
stick up through the holes on the hearth slabs.
HEARTH PIECE
ALL-THREAD 12”
WASHER/NUT
CONCRETE BOARD
(NOT PROVIDED)
METAL
BASE
INSULATION
BLANKET
WASHER/NUT
WASHER/NUT
ALL-THREAD 6”
PLYWOOD SHEATHING
EMBER SHIELD
(UNDER FP OPENING)
FLOOR JOIST
BRACKET
Figure 18
b) Non-combustible Floor Installations:
Draw an outline of the hearth area based on the
dimensions shown in Figure 19. Position Hearth slabs
and mark rebar center locations.
Figure 19
Four 26ga.galv. 4” wide
Hearth Ember Shields
required (not supplied)
LH Hearth 2nd
RH Hearth 1st
53”
28”
Apply mortar
between joints
2” min
overlap typ.
Drill 4 inches into concrete slab and secure the four
pieces of rebar with epoxy (Figure 20).
Drill Ø5/8” hole
x 4” deep
Epoxy #3 rebar
centered into hole.
Use ITW Epoxy or
Simpson Epoxy.
For concrete
foundations
less than 6”
thick, drill
slanted.
Figure 20
3) Before installing the side walls, conrm placement of
outside combustion air side block (if required), this can
be installed either side depending on which side is
accessible to outside combustion air. Prepare side wall
footprint with the prepared mortar.
4) Keep the assembly of the next sections of the rebox
side walls moving up, keeping components moist, mixing
mortar as you need it and properly threading mortar as
you stack each section, one onto the next. Constantly
check for squareness and levelness while building each
MFPST43 Fireplace AssemblyMFPST43 Fireplace Assembly
Field Assembly ProceduresField Assembly Procedures
a) Mixing the MASON-LITE mortar – The mortar comes
premixed and should be dry. Be sure to use clean water and
work it up into a mixture that is pasty but not lumpy. If it’s
too thin and the surfaces don’t stay moist, the components
will not adhere. Load the mixture into a standard grout bag.
b) Apply about ½” (one-half inch) thread of mortar. The mortar
bead should be approximately ½” (one-half inch) away from
all edges. The mortar has a considerable amount of holding
power so do not overload the components with too much
mortar. Keep the components moist at all times!
c) Some mortar will “ooze out” when placing components
together, this is normal. Wipe excess away with a trowel. Do
not cover component surfaces completely with mortar. Do
not apply the mortar in thick bands even if the component
you are working with is larger than the rest. You will want to
apply “stripes” of mortar in these situations.
d) Make sure components are level. It’s extremely important
that you pay careful attention to how you are assembling
the Mason-Lite Fireplace since every component builds on
the next. If you have to make any kind of an adjustment,
do not try to do it “by loading an opening” with mortar, this
will only result in a replace that will not be plumb or level.
Use wood shims instead. You will nd these small wood
shims supplied with the Mason-Lite Fireplace and
you can nudge them in between openings to achieve the
precision you need in making component adjustments.
Once you have inserted any shims, you will want to
cover any gaps that may have resulted with the mortar.

13
course of block. As you complete each section, make
certain that you adhere the mortar at each and every
joint.
Figure 21
Setting Firebox Sides
5) After the last side walls are in place, add #3 rebar rods
and ll the rebox cells with mortar mix. Mix approx. 2 cu.
ft. of sanded mortar mix. Put 25% in cells and place #3
rebar vertically into holes on the hearth base. If a raised
metal platform was installed, place adjacent to all-thread
rods sticking through the cells. Make sure the bars are
into the hearth and at least 1/2” (one-half inch) below top
of rebox top surface. Finish lling cells.
Keep damp at
all times while
applying mortar.
Figure 22
IMPORTANT! Keep in mind that, when applying the
mortar, you must frequently run a damp sponge to the
parts before mortar is applied!
6) Set the Lintel, Lower Dome Front and Angle Iron in place
for both sides as shown in Figure 22. Lintel fronts should
be ush with front of replace. Lower Dome Sides t
between Lower Dome Fronts (Figure 23). Check that all
is level. If you need to make adjustments, use shims.
Place one or more of these shims between the lowest
wall component and the top surface of the base plate.
Once you are satised with the degree of levelness, you
can address any gap that may have occurred with an
appropriate amount of mortar.
Figure 23
Note: Although you are cautioned to use MASON-LITE
mortar sparingly because it does have such holding
power, you should look over the rebox assembly at the
end and ll in any gaps, especially joint connections, with
the mortar. Needless to say, you must make adjustments
to be sure the replace is level and square while the
mortar is still wet.
Figure 24
Top surfaces
to be level.
7) Make sure the Lower Side Domes are positioned so that
the beveled face lines up with the inward angles of the
lintel sides (see Figure 24). Top surfaces should be level.
8) Now assemble the Upper Dome Fronts and Upper Dome
Sides on top of lower dome assembly as shown in
Figure 25. These parts require care in leveling, noting
the parts have a slight bevel. Check with level.
Figure 25
Upper Dome
Front
Upper Dome
Sides
9) As you are connecting each MASON-LITE component,
be certain you are following the instructions given
previously for using MASON-LITE mortar. Stop to look
at the smoke dome side, front and rear walls to see
that they are aligning correctly and that the surfaces be
smooth and uniform. Make sure connections are covered
with an adequate amount of mortar. Remember that
you have the option of using shims and covering them
with mortar if you need to. Make any adjustments to the
replace alignment before continuing to the next step.
10) Check your assembly here. If things are proceeding as
they should be, the nished top surface should be at
and level.
11) Now you can set the Anchor/Damper Plate into position.
Be sure that it is ush in every direction as you place it
on the crest of the smoke dome wall assembly.
Lintel
Lower
Dome
Front
4x3 Angle Iron
Lower
Dome
Side

14
Figure 26
Completed
Firebox
12) For Anchor/Damper Plate Installation Instructions go to
page 17.
13) Now that you have completed the smoke dome
assembly, all the components should stack up for a
smooth transition into the ue components. Setting the
smoke dome completes the MASON-LITE Firebox and
Smoke Dome assembly. You are now ready to begin the
installation of the necessary rebrick lining and the ue
components.
Figure 28
WARNING: DO NOT PACK REQUIRED AIR SPACES WITH
INSULATION OR OTHER MATERIALS.
Firestop Radiation Shield
AFirestop Radiation Shield is required in multistory installations
at each oor penetration above that where the Support Box is
located as shown in Figure 29.
Figure 29 Firestop Spacer with Living
Space Above Ceiling
Firestop
Spacer
Existing
Ceiling
Frame
eight
#8 x 3/4
Screws
Firestop Radiation Shields also provide complete separation
from one oor space to another or attic space as required by
most codes. When the double wall pipe passes through a
framed opening into an attic space, the restop must be placed
into an attic oor as shown in Figure 30.
Figure 30 Firestop Spacer with Attic
Space Above Ceiling
Firestop
Spacer
Existing
Ceiling
Frame
eight
#8 x 3/4
Screws
Follow your chimney manufacturer’s instructions on specic
guidelines pertaining to their chimney and Firestop Radiation
Shield installation instructions.

15
Mason-Lite Firebrick Liners
Custom Firebrick Lining
Custom Firebrick lining is not supplied by Masonry Fireplace
Industries (MFI). There is, however, the option of modular
pre-fabricated panels that can be obtained from MFI. See
Figures 33 & 34 for details.
If custom rebrick lining is desired, 1-1/8” inch thick liners will
be required. The pattern for the rebrick lining is exclusively
your choice. Before you install the lining, remember to consider
any holes your contractor may need to drill for gas, electrical
or combustion air kit access holes.
Please use a certied mason to lay-in the brick. He will follow
the proper instructions from the replace liner manufacturer
and also understand the type of adhesive or cement he is to
use.
Make sure the replace is installed with the nished rebrick
oor of the replace so that it is at least 13” (thirteen inches)
above the combustible oor system.
Figure 31
13 INCHES
MINIMUM TO
COMBUSTIBLE
FLOOR
FINISHED
FIREBRICK
HEARTH
LINER
Finished Height to Combustible Floor
Disclaimer: Masonry Fireplace Industries wishes to express
that as the manufacturer of Mason-Lite Fireplaces, they cannot
take any liability or responsibility for they way the firebrick or
the firebrick mortar performs. It is not unusual in the course of
the life of the firebrick, or the firebrick mortar, for heat stress
cracks to appear. MFI cannot be responsible for this and other
wear and tear to the firebrick and mortar.
Modular Firebrick Lining
If using our Mason-Lite Firebrick Liners, simply use an extra
bucket of the mortar we supply. Install Hearth Liner rst, then
continue with sides. Consider if brackets for grates will be
required also if pre-drilling is required for gaslines, electrical
or if the outside combustion air kit is to be installed. If the
optional Arch is used, the top corners of the rebrick side
liners will need to be notched (see Figure 32).
The following Firebrick Liners are available from MFI:
MFPST43SHBL- Herringbone
MFPST43FRBL- Running Bond
Figure 32 Sectioned Side View
If Optional Arches
are used, corner
notching will be
required on all
four places.
Running Bond Brick Pattern
Figure 34
Figure 33 Herringbone Brick Pattern

16
Fireplace Finishes & Combustible Trim
Clearances
Hearth Material & Dimensions – Codes are strict regarding the
use of proper materials for hearth extensions and the proper
dimensional characteristics.
All hearth extensions must be made of code-rated,
noncombustible materials such as tile, brick, concrete or
stone. MASON-LITE Fireplaces usually have an opening of
approximately 8 sq. ft. (eight square feet) that translates to a
hearth extension of about 20” (twenty inches) at the replace’s
opening and about 12” (twelve inches) extension at each side.
These relative dimensions are also covered by code.
Figure 35
43"
NON-COMBUSTIBLE
HEARTH EXTENSION
BOTH SIDES
11
2"
24" min
12
20
30"
20" GRATE SIZED
50% OF HEARTH
AREA MAX.
Note that it is required that metal safety strips must be laid on
the oor of the non-combustible raised platform. These should
be 26 gauge and measure 4” (four inches) wide. They need
to extend half way under the platform and half way under the
hearth extension material (see Figure 19).
Attention: You will note that there will be a gap between the
replace front and the extension of the non-combustible hearth
material. Be certain that you seal this with non-combustible
material.
1/2" THICK
CONCRETE
BOARD
CLASS "A"
CHIMNEY
SEE FIG.
29 AND 30
SEE FIG. 27
2" AIRSPACE
CLEARANCE TO
COMBUSTIBLES
ON REAR AND
SIDES OF UNIT.
ONLY NON-COMBUSTIBLE
MATERIAL WITHIN 18” OF
TOP OF OPENING.
28”
8” METAL
PLATFORM
1/2”
2”
seal gap with
non-combustible
material
Figure 36
Mantle and Mantle Shelf Clearances
As with any radiant heat replace, all MASON-LITE Fireplaces
must comply with building code safety clearances, for units
that have openings of 6 sq. ft. (six square feet) or greater.
For Mantel clearances see Figure 9.
Walls that Adjoin – your replace cannot be installed closer
than 2 ft. (two feet) to any adjoining walls in the room where
the replace is.
Caution in Regards to Combustibles – If any part of the
replace or objects in the room (curtains, rugs, paint, cushions,
etc.) start to show warping or discoloration due to heat from
the replace, it is time to take immediate action. Do not use
the replace until you have gured out how to address the
problem. You are facing a potential re hazard. MFI cannot be
responsible for the make-up of material on the exterior of the
replace you have chosen, nor can MFI be held responsible
for the materials in a room that may be responding negatively
to heat. However, in almost all cases, there is a solution to
the problem, either by making adjustments to airow or the
modications to the room itself.
Installing Outside Combustion (make-up) Air
1) The Mason-Lite Fireplace needs enough make-up air to
function properly and some local building codes may require
outside combustion air to be provided. If no make-up air is
provided, improper ue drafting may occur, creating negative
pressure whereby smoke may enter the home, especially in
homes that are very well insulated and tightly sealed. Check
local building codes for specic requirements.
2) Install Combustion Air Kit MFP4-AK into the MASON-LITE
Firebox through the side wall opening provided. The tubing
that goes out of the rebox wall must feed into a exible metal
conduit as the source for outside combustible air. It can go
straight out through an outside wall or into a ventilated crawl
space. If crawl space is used, check codes for proper
termination.
Figure 37
Internal
Wall
Installation
Island
Installation
Outside Air supply
from side wall or
ventilated crawlspace
Outside Air supply
from crawlspace

17
3) Be sure that you carefully check the source of the outside air
before you choose the site for your air intake. You don’t want
a place where snow will collect, where bushes or trees will be
growing or a location that is too close to any other structure.
4) Install a screened termination cap to keep out animals.
Adding a Gas Pipe
You may elect to add a vented decorative gas appliance (gas
log) to your Mason-Lite Fireplace. If so, follow the installation
instructions from the Decorative Gas Appliance manufacturer.
Familiarize yourself with requirements for installation as
outlined by the National Fuel Gas Code, ANSI Z223.1. This
gas pipe provision should only be used on a decorative gas
appliance.
1) You can route the gas piping practically anywhere in the
rebox – the oor, back wall or side walls. You will just need
a masonry drill; the instructions from the gas appliance
manufacturer will be very straightforward.
2) Fill in the holes you have drilled around the gas piping with
the regular MASON-LITE mortar.
3) Follow the Gas Log manufacturer’s instructions.
Adding Electrical Connection
Like the gas line, electrical feed lines can be run through
the oor, back wall, or side walls. Follow local building and
electrical code requirements.
MASON-LITE Chimney Systems:
The Mason-Lite Fireplace requires the following chimney
systems:
All chimney systems must be installed with an integrated
damper/base plate installed on top of unit. Installers are
cautioned to put the chimney system together exactly as
instructed and shown in chimney manufacturer’s guide. Any
variations may have serious consequences resulting in an
accident or malfunction. If instructions are not followed, the
warranty on the product will become null and void.
Note that the most important aspect of the installation is
maintaining the minimum required clearances to combustible
materials according to the chimney pipe manufacturer’s
recommendations, otherwise a potential re hazard may
occur.
Warning: do not interchange chimney manufacturer’s parts
with any other parts except those specically required by
the chimney manufacturer’s recommendations otherwise a
potential hazardous condition may be created.
Attention: When choosing a Chimney System it must meet the
following requirements:
• Designed for installation in accordance with the National
Fire Protection Standard and UL 103.
• Meets the requirements of NFPA 211.
• Designed in accordance with ICC Codes.
Assuming you have sections of vertical pipe that are more
than 10’ (ten feet) measuring between elbows, you must insert
– at midpoint – a chimney stabilizer. When installing the
stabilizer, pull out the support straps with a good amount of
tension and hammer to the frame.
Figure 38
Return
Elbow
Elbow
Return
Elbow
Elbow
6' Max.
6' Max.
A
6' Max.
6' Max.
Return
Elbow
Elbow
Elbow
Return
Elbow
B
6' Max.
6' Max.
C
Elbow
Ceiling
Support Pipe
12S-12DM
Return
Elbow
Mason-Lite Fireplace
MFPST43
Chimney System
UL103-16” I.D. Class A
Installing Damper and Chimney System
The Damper System/Anchor Plate assembly is required
for the installation of these chimney systems. Consult the
Chimney System manufacturer’s instructions.
1. Using the Damper/Anchor Plate Assembly, apply a 1/4”
(one-quarter inch) bead of gasket cement around the base
of the Anchor Plate. Apply ceramic blanket gasket to the
gasket cement.
Figure 39
Apply a 1/4” bead of
gasket cement around
base of Anchor Plate

18
2. Apply balance of gasket cement in a 1/4” (one-quarter
inch) bead on top of smoke dome top approx. 3” (3 inches)
outside of outlet hole. Install damper on top of unit pressing
damper into cement.
Figure 40 Chimney Anchor Plate Installation
secure with four 1/4-inch
masonry fasteners.
Run a 1/4” bead
of gasket cement
around ue.
3. Place chimney adapter onto top of damper plate and
center in opening using gasket supplied with adapter.
4. Attach adapter with (12) #8 cement fasteners supplied,
carefully drilling holes into damper plate.
5. Attach damper chain stop on center rear of lintel 3” (three
inch) vertical from opening using (3) #8 cement fasteners.
Attention: Clearance to combustible construction cannot be
reduced during course of construction. For the safe operation
of the nished replace, these clearances must be followed
when building the framework for the chimney system.
Finishing Your Installation
To complete your replace installation, a replace grate will
be required for safe operation. The replace grate must be
sized to 50% of the hearth maximum. Additionally, a replace
screen must be installed for safety.
Fireplace Door Accessory
IMPORTANT: Only Crown-Breckinridge or McKenzie-
Pendelton Doors are approved for use with this replace.
For installation Instructions, see separate instructions included
with doors.
Mason-Lite Owner’s Operation & Precautions
Installers of the Mason-Lite are urged to leave the owner’s
manual with the unit after installation is complete.
WARNING: Do not attempt to operate your replace without
a re safety screen installed.
CAUTION: The manufacturer cautions against using chemical
chimney cleaners. Never use charcoal or coal in the replace
under any circumstances.
1) First Lighting of the Mason-Lite – After construction is
completed, all elements of the replace and chimney
system must be completely dry. This means that the unit
must stand without any ring for a minimum of 28 days.
Only after that period of time can a rst lighting take place.
The rst re must be small and well-controlled, started
with a small amount of kindling. Add no more than eight
pounds of wood, preferably small logs not more than 3”
(three inches) in diameter. You will probably burn no more
than three to four of these small logs. Do not let the re
burn for more than one hour. After this rst lighting – when
the replace has started to “cure” Do not set another re
for at least 24 hours.
2) Second Lighting – Start the re slowly and gradually as
you did with the rst lighting, but this time you can burn up
to ten pounds of rewood, probably four to ve logs that
are 3” (three inches) in diameter. With the second lighting
you can let the re burn two hours – no more.
3) After First and Second Lightings – When the replace
has been properly cured with 1st and 2nd lightings, you
will be able to add a full fuel load to the MASON-LITE
which is about 10 to 15 pounds of rewood at any given
time. Consider that this typical fuel load is three to four dry
hardwood logs that are about 6” (six inches) to 8” (eight
inches) in diameter.
4) Without a grate for your rewood to rest on, you cannot
get the air ow you need under the re which makes for a
hotter, more satisfying re.
5) Don’t “over burn” – Always remember, your Mason-
Lite Fireplace is an elegant addition to your home.
It is not an indoor incinerator! If you start to use the
replace and begin a routine of “over burning,” you
can permanently and unalterably damage the unit.
Under no circumstances should you be burning
household trash, including chemicals and combustibles,
cardboard boxes, your o󰀩ce papers, scrap lumber
or stray branches from your yard, particularly pine.
WARNING: Burning of above mentioned materials will
cause an unsafe condition and will void your warranty!

19
Starting a Fire and Basic Operation
Before starting a re in your replace, open the damper to
its’ fully open position. Crumple some paper and place it on the
log grate. Use some soft, dry wood as kindling and put it on top
of the paper. Place some small logs or split logs atop the paper
and kindling.
Finish o󰀨 the fuel load with a couple of hardwood logs or
split logs – oak or hickory. Check to see that you’re stacking the
logs so that they will fall inside the grate as they burn.
To get the most out of your wood, it is recommended that
you let it set and completely dry out for nine months to a year.
When you are satised with the arrangement of your wood
load, light the paper which in turn will ignite the kindling, then
the softer wood and nally, the harder wood logs. As the re
burns, you can carefully lay additional logs on the ame, but
make sure you place them gently without forcing them into the
opening.
ANNUAL FIREPLACE MAINTENANCE
Your replace and chimney require seasonal and
monthly tune-ups”. Like any piece of well-built equipment, the
Mason-Lite Fireplace and chimney needs routine maintenance.
The manufacturer recommends that inspection of the
replace and chimney take place on a monthly basis during the
heating season.
Start at the top, looking for birds’ nests, leaves or any
other obstructions. Also check the spark arrestor, for creosote
or soot build-up. Twice a year, you will want to clean the rebox
and chimney yourself or hire a professional chimney sweep to
do the job for you. If you elect to do it yourself, use a plastic,
wood or steel brush for the inside of the chimney.
For the spark arrestor, scrub with a wire brush. To
dismantle the chimney cap for cleaning of the ue, unscrew
the four screws that hold it in place. For cleaning access from
below, open the damper in the rebox. It is best to use a exible
handle chimney cleaning brush made especially for the job.
If your replace system has any o󰀨set chimney
sections, start cleaning with the exible brush from the top of
the section downward to the elbow. Then clean from the rebox
up to the o󰀨set/return section.
Be sure that you have covered the oor of the replace
and out to the hearth with a damp sheet that has been taped
securely in place. When all the soot has settled, remove the
sheet and vacuum up – don’t sweep the excess soot.
Never use any chemical cleaners to clean the insude
of your ue as their residue could introduce a re hazard after
the task is completed.
Outside Inspection – During your once a month
inspection of the rebox and chimney, make it a point to also
check the outside of the chimney, the metal ashing and weather
seals that surround it. If you nd any cracks or openings around
screws or nails, seal them to avoid any roof or chimney chase
leaks.
SURFACE CRACKS
The MASON-LITE FIREPLACES are manufactured
using high quality materials. During the drying process, surface
cracking may occur. These small cracks (under 1/16” will not
e󰀨ect the replace safety or performance). During the assembly
process, ll surface cracks with thin-set mortar and brush when
drying for a smooth surface nish.
Removal of Creosote and Soot Formation – Creosote
vapors are known to form in the relatively cool chimney ues
of slow burning res, hence, creosote residue collects on
the ue lining. Because of soot and creosote build-up, it is
recommended that the replace and chimney cleaning be done
twice a year. In colder climates, cleaning should be done more
often.
Always allow the replace to completely cool before
you work on it, which means, of course, shutting o󰀨 all gas and
electrical connections, also.
Be certain that you use only solid fuel in your replace.
You may use a natural or LP gas log lighter as a method to start
your wood re.
The ue damper must be in the OPEN position
whenever there is heat in the replace.
CUSTOMER SERVICE & PARTS REPLACEMENT:
Parts and accessories may be purchased from your
local dealer. Additional information is available from Masonry
Fireplace Industries, Inc.
Accessory orders will be accepted by mail, or you may
call your order in Monday through Friday from 8:00 a.m. to 5:00
p.m. (Pacic Standard Time) at: (800)-345-7078.