mFi MASON-LITE MFP72-RGL Owner's manual

THIS WOOD-BURNING FIREPLACE COMPLIES WITH STANDARDS UL127 AS A FACTORY-
BUILT APPLIANCE.
SAVE THIS BOOK
This book is valuable. In addition to instructing you on how to install and maintain your appli-
ance, it also contains information that will enable you to obtain replacement parts or accessory
items when needed. Keep it with your other important papers.
This replace is approved for use as a wood burning replace or for use with a vented gas log
approved to ANSI Z21.60 standards. It has not been tested or approved for unvented gas logs.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Do not store gasoline or other ammable vapors and liquids in the vicinity of this or any other
appliance.
Report No. 08-154
PFS
®
US
NOTE: DIAGRAMS AND ILLUSTRATIONS THROUGHOUT THE MANUAL ARE NOT TO SCALE.
WARNING
Do not install this replace directly on combustible material. For combustible oor installation,
use only approved non-combustible support structure.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual for correct installation and operational procedures. For assis-
tance or additional information consult a qualied installer, service agency or the gas supplier.
MFP72-RGL
Installation and Operation
Instructions
Masonry Firebox Models
MFP72-RGL / MFP84-RGL / MFP96-RGL / MFP108-RGL / MFP120-RGL

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2
TABLE OF CONTENTS
Cover Page..........................................................................................................1
Table of contents................................................................................................2
Example Rating Label......................................................................................3
Safety Information.........................................................................................4 - 5
Installation........................................................................................................4
Guidelines for Use............................................................................................4
Warnings ..........................................................................................................4
Intended Use....................................................................................................5
Operational Information....................................................................................5
Parts List ......................................................................................................6 - 15
MFP72-RGL Firebox Parts List ...................................................................6 - 7
MFP84-RGL Firebox Parts List ...................................................................8 - 9
MFP96-RGL Firebox Parts List ...............................................................10 - 11
MFP108-RGL Firebox Parts List .............................................................12 - 13
MFP120-RGL Firebox Parts List .............................................................14 - 15
Firebox Dimensions ..................................................................................16 - 18
MFP72-RGL and MFP84-RGL ......................................................................16
MFP96-RGL and MFP108-RGL ....................................................................17
MFP120-RGL ................................................................................................18
Product Overview.............................................................................................19
Const./Assy. Phases of a Mason-Lite Fireplace ........................................................19
Pre-Installation...........................................................................................20 - 29
Selecting Location..........................................................................................20
Clearances.....................................................................................................20
Understanding Clearance to Combustibles .................................................20
Clearances to Combustibles......................................................................20
Firebox Framing & Clearances ...............................................................20 - 23
Combustible Floor Clearances.......................................................................23
Mantels & Mantle Shelf Clearances........................................................... 23
Caution in Regards to Combustibles .........................................................23
Suporting Floor Systems................................................................................24
Combustible & Non-Combustible Floor .....................................................24
Rebar Locations.........................................................................................24
Wood Floor ................................................................................................ 24
Crawl Space or Upper Floor ......................................................................24
Mason-Lite Weight Determination .............................................................25
Other Weight Considerations..................................................................... 25
Combustible Floor Installations...............................................................26 - 27
8" CMU Blocks...........................................................................................26
Hearth Ember Shields................................................................................27
Venting ...........................................................................................................28
Class A Chimney Pipe ...............................................................................28
Mason-Lite Fireplace & Chimney System............................................................... 28
Seismic / Non-Seismic Code..........................................................................28
Tools and Materials Required for Installation ..........................................28 - 29
Tools Needed for Installation......................................................................29
Materials Needed for Concrete Slab.......................................................... 29
Materials Needed for Combustible Floor........................................................29
Field Assembly Procedures .......................................................................29
Firebox Installation....................................................................................30 - 33
High Temperature Dry Mortar Mix ..................................................................30
Mixing Instructions .....................................................................................30
MFP72/84/96/108/120-RGL Fbox . Assy. Instr...................................................30 - 33
Venting and Accessory Installation......................................................... 34 - 37
Installing Damper and Chimney System........................................................34
Installing Firestop Radiation Shield................................................................35
Installing Outside Air ......................................................................................35
Chimney Pipe.................................................................................................36
Assy. & Inst. of Double Wall Chimney System .............................................................36
Adding a Gas Pipe .........................................................................................36
Adding Electrical Connections........................................................................36
Fireplace Grate and Screens .........................................................................36
Firebrick Lining...............................................................................................37
Modular Firebrick Lining ............................................................................37
Fireplace Finishes & Combustible Trim..........................................................37
Operation & Precautions ..........................................................................38 - 39
Mason-Lite Owner's Operation & Precautions....................................................38
Starting a Fire and Basic Operation...............................................................38
Annual Fireplace Maintenance.......................................................................39
Customer Service & Replacement Parts........................................................39
Available Accessories...............................................................................40 - 42
CMU Block Layout.....................................................................................43 - 44
Appendix I ........................................................................................................45
Appendix II ...................................................................................................46
Appendix III ..................................................................................................47
Notes...........................................................................................................48 - 50
Limited Lifetime Warranty ...............................................................................51
Installer/Customer/Unit Information ..............................................................52

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EXAMPLE LABEL.
Below is a sample picture of the rating plate that is located inside the lower dome side of your replace. Model Number,
Date of Manufacture and Serial Number should be stamped on the plate where indicated.
6. HOLES: 4x Ø0.14 THRU
5. BOXES TO BE STAMPED DURING MANUFACTURE.
4. LARGE TEXT TO BE BOLD UPPERCASE ARIAL, 10 PT. MIN. (WHERE 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: PLATE, RATING, STANDARD-RGL
P/N: MFP-RGL
REVISION: A
REV. DATE: 07-03-2023
LAST MODIFIED BY: SS
FILENAME: MFP-RGL-RL_PLATE_RATING_STD-RGL_REV_A
REVISION COMMENTS:
07-03-2023 REV A: Initial release of REGAL Series Fireplaces
DATE
OF MFG.
SERIAL
No.
LISTED MASONRY FIREPLACE SYSTEM COMPLIES WITH APPLICABLE
REQUIREMENTS OF UL127.
Fireplace is designed for installation per the National Fire Protection Association Standard
for Chimneys, Fireplaces, Vents and Solid Fuel-Burning Appliances (NFPA 211).
MODEL
No.:
DO NOT REMOVE THIS LABEL
listed Chimney Pipe as follows:
MFP72-RGL, MFP108-RGL and
MFP120-RGL: UL103-14”-Class A
MFP84-RGL & MFP96-RGL:
UL103-16”-Class A
Please refer to pipe manufacturer’s
installation instructions.
WARNING: Use only approved,
!
TO REDUCE THE RISK OF FIRE OR INJURY, DO NOT INSTALL AN UNVENTED GAS LOG SET INTO FIREPLACE.
THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED GAS LOG SET.
WARNING:
!
MFP-RGL-RL_REV_A_07-2023
THIS APPLIANCE NEEDS FRESH AIR FOR SAFE OPERATION AND MUST BE INSTALLED
SO THERE ARE PROVISIONS FOR ADEQUATE COMBUSTION AND VENTILATION AIR.
MANTEL CLEARANCES:
SEE INSTALLATION MANUAL
FOR DETAILS.
MANTEL ABOVE OPENING:
MIN. - 3” SHEATHING OR
TRIM TO OPENING SIDES 8”
!
WARNING: 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.
DO NOT USE A FIREPLACE INSERT OR OTHER
PRODUCTS NOT SPECIFIED FOR USE WITH
THIS PRODUCT.
THIS FIREPLACE HAS NOT BEEN TESTED FOR
USE WITH GLASS DOORS. TO REDUCE THE
RISK OF FIRE OR INJURY, DO NOT INSTALL
GLASS DOORS.
CONSULT OWNER’S MANUAL INCLUDED WITH
THIS FIREBOX FOR FURTHER INFORMATION .
Report No. 08-154
MFP72-RGL MFP84-RGL MFP96-RGL MFP108-RGL MFP120-RGL
MFI
Masonry
Fireplace
Industries, Inc.
6391 Jurupa Ave.
Riverside, CA 92504
See MFI’s installation and operating instructions fo this model.Contact local
building officials about restrictions and installation specifications in your area.
Tested & Listed By
PFS
®
US
7.00”
6.75”
FIREPLACE CLEARANCES TO COMBUSTIBLES:
UNIT FRONT, SIDES, REAR ................................................. 2” (51 mm)
COMBUSTIBLE FLOOR ........................................................ 8” (203 mm)
COMBUSTIBLE SHEATHING ABOVE OPENING TOP .... 38” (965 mm)
SHEATHING OR TRIM TO OPENING SIDES ...................... 8” (203 mm)
MANTEL ABOVE OPENING ................................................ 12” (305 mm)
OPENING TO SIDE WALL ................................................... 24” (610 mm)
HEARTH EXTENSION BEYOND FRONT .......................... 20” (508 mm)
HEARTH EXTENSION BEYOND SIDES ........................... 15” (305 mm)
INSULATION FROM FIREBOX ............................................. 2” (51 mm)
Chimney Height:
Max.: 40 ft.
Min.: 14 ft. (17 ft. with 1 or 2
offset sections Maximum)
.12”
5.00” 4.75”
EXAMPLE ONLY

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SAFETY INFORMATION
The Mason-Lite Regal Masonry Fireplace is a modular refrac-
tory masonry unit designed for eld assembly. The rebox
is constructed using pre-cast, interlocking refractory blocks.
The blocks are secured together using Mortar. The system
includes all parts necessary for the assembly of a complete
masonry replace. The rebox enclosure must be lined
with 2-1/2” thick rebrick (ASTM-C1261) not supplied. The
rebricks will be applied within the walls and hearth area of
the rebox.
INSTALLATION
Before Beginning the Installation
Read these instructions carefully BEFORE installing this
replace. If installing an ANSI Z21.60 Decorative Gas Log,
follow the appliance manufacturer’s sizing and suitability
recommendations.
Check local codes before installing this replace. Permits
may be required.
GUIDELINES FOR USE
All current and future users of Mason-Lite Regal 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, general
contractor or whoever assumes the liability for installation
of this product, to insure that the work is conducted accord-
ing to the guidelines and instructions of this manual. Note
that the general contractor is responsible for assuring that
the clearance to combustibles specied by this manual are
strictly followed.
WARNINGS
IMPORTANT
Check local codes before installing this
replace.
WARNING
A re or an explosion may occur resulting in
property damage, injury or loss of life if you
do not follow the information in this manual.
WARNING
Do not install unvented appliances into this
replace. This replace has not been tested
for the use with unvented gas log sets.
WARNING
Do not store gasoline or other flammable
vapors and liquids in the vicinity of the ap-
pliance.
WARNING
This replace is not intended to be used as
a substitute for a furnace to heat an entire
home. Use for supplemental heat only.
WARNING
Specied venting parameters (type, size and
height requirements) must be strictly fol-
lowed. See Venting and Accessory Installation
pages 34 thru 37.
WARNING
For MFP72-RGL, MFP108-RGL, MFP120-RGL:
Install only approved, listed UL 103-14” I.D.
Class A Chimney System.
For MFP84-RGL, MFP96-RGL: 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.
WARNING
Do not install a replace insert or other
products not specied for use with this
replace.

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OPERATIONAL INFORMATION:
For solid fuel, use only properly dried cord wood or processed
solid wood fuel re logs. When using processed solid fuel
re logs, do not poke or stir the logs during burning. Use
only processed solid fuel re logs that have been evaluated
for replace application. Follow all package instructions and
warnings.
Do not store or use any ammable materials (solid, liquid
or vapor) such as gasoline in the vicinity of this or any other
open ame appliance.
Due to high temperatures during operation, this replace
appliance should be located out of tra󰀩c and away from fur-
niture and draperies. Do not place clothing, furniture or other
ammable materials on or near the appliance.
When using an approved gas re feature appliance with this
replace, follow the gas appliance manufacturer’s installation,
safety and operational instructions.
Never leave children unattended when a re is burning in
the replace.
INTENDED USE
Statement of Intended Use
The Mason-Lite Regal Fireplace is a decorative supplemental
heat source designed for use with only:
-Solid Wood Logs or approved processed solid wood fuel logs
-Plumbed LPG or Natural Gas Log Lighter.
-Plumbed ANSI Z21.60 Decorative Gas Log appliance.
The Mason-Lite Regal Fireplace is not intended as a primary
means of heating and cannot substitute for a home furnace.
The Mason-Lite Regal replaces and chimney systems are
designed to be installed indoor or outdoor. The Mason-Lite
Regal replace and chimney systems are intended for instal-
lation in residential homes and other buildings of conventional
construction.
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.
IMPORTANT SAFETY INFORMATION Continued
WARNING
Firebox must be lined with rebrick (ASTM-
C1261).
WARNING
This product can expose you to chemicals
including Carbon Black, which is known to
the State of California to cause cancer, and
Carbon Monoxide, which is known to the
State of California to cause birth defects or
other reproductive harm. For more informa-
tion go to www.P65Warnings.ca.gov
FOR YOUR SAFETY
• Do not store or use gasoline or any other
ammable vapors or liquids in the vicinity
of this or any other appliance.
• Due to high temperatures, the appliance
should be located out of tra󰀩c and away
from furniture and draperies.
• Do not place clothing or other ammable
materials on or near the appliance.
• Never leave children unattended when a
re is burning in the replace.

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MFP72-RGL FIREBOX PARTS LIST:
PARTS LIST (Combustible & Non-Combustible Floor)
Note: If your installation is on combustible oor, the total
replace height will increase due to the addition of the
required CMU blocks, cement board & insulation blanket.
NOTE: See page 43, for CMU Block layout
Only approved non-combustible support structure must
be used when installing on combustible oor systems.
See Pages 24 thru 27 for combustible oor and framing
anchoring illustrations when using CMU blocks.
1
1
2
3
6 6
6 6
7
7
7
8
13
13
14
17
18
18
19
20
20
23
23
20
20
19
18
18
18
18
9
7
4
5
10
11
12
15
16
21
22
23
25
26
27
21
22
24
16
5

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PARTS LIST (Combustible & Non-Combustible Floor) Continued
MFP72-RGL FIREBOX PARTS LIST:
NOTE:
1 ITEMS NOTED ARE SOLD SEPARATELY.
2
ITEMS INDICATED AS “NOT SUPPLIED” CAN BE OBTAINED
FROM YOUR LOCAL HARDWARE STORE.
ITEM P/N Description QTY
1MFP39-1 Hearth, Left or Right 2
2MFP39-1A Hearth, Middle Left 1
3MFP72-1 Hearth, Middle Right 1
4MFP49-3A Side Wall W/Ø4 1
5MFP49-3 Side Wall 9
6 MFP72-2 Rear Wall 4
7MFP39-2 Rear Wall 4
8MFP72-4L Smoke Shelf Left (Draft Diverter) 1
9 MFP72-4R Smoke Shelf Right(Draft Diverter) 1
10 MFP84-6AL Lintel, Front Left 1
11 MFP84-6AR Lintel, Front Right 1
12 MFP108-6AM Lintel, Front Middle 1
13 MFP84-6 Lintel Left/Right 2
14 MFP84-6M Lintel Middle 1
15 NOT SUPPLIED ² Angle Iron 6" x 4" 1/2" x 81-1/4" 1
16 MFP49-7A Dome, Side - Lower 2
17 MFP72-5M Lower Dome Rear Center 1
18 MFP72-5S Lower Dome Rear Side 6
19 MFP96-10M Middle Dome Center Front-Rear 2
20 MFP108-10S Middle Dome Side 4
21 MFP49-8 Dome, Side, Upper 2
22 MFP49-7(B) Dome Side Top 2
23 MFP72-9 Dome Top 2
24 NOT SUPPLIED ² Anchor Plate Insulation or High-Temper-
ature Sealant
2
25 SOLD SEPARATELY114 Inch Damper/Anchor Plate 2
26 REBAR #3 Rebar (Ø3/8”) X 40” 8
27 MFP4-AK-M ¹ Outside Air Kit, 4" Dia 1
FOR COMBUSTIBLE FLOOR SYSTEMS
(Not shown)
28 NOT SUPPLIED ² CMU Blocks 8" x 8" x 16" 12
29 NOT SUPPLIED ² 1” Fiberglass Insulation Blanket 2
30 NOT SUPPLIED ² Cement Board 2
31 NOT SUPPLIED ² Assy, Floor Joist Brace 24
32 NOT SUPPLIED ² Allthread 1/2-13 X 12" 10
33 NOT SUPPLIED ² Allthread 1/2-13 X 10" 14
34 NOT SUPPLIED ² 1/2-13 Unc Hex Nut 48

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PARTS LIST (Combustible & Non-Combustible Floor) Continued
MFP84-RGL FIREBOX PARTS LIST:
Note: If your installation is on combustible oor, the total
replace height will increase due to the addition of the
required CMU blocks, cement board & insulation blanket.
NOTE: See page 43, for CMU Block layout
Only approved non-combustible support structure must
be used when installing on combustible oor systems.
See Pages 24 thru 27 for combustible oor and framing
anchoring illustrations when using CMU blocks.
4
5
6
6
6 6
6 6
6 6
7
7
7
7
8
9
11
14
10
16
19
19
19
19
19
17
18
14
19
17
15
12
13
22
23
24
24
23
22
27
26
28
25
5
20
20
21
21
21
21
1
1
2
2
3

mason-lite.com 9
PARTS LIST (Combustible & Non-Combustible Floor) Continued
ITEM P/N Description QTY
1MFP39-1 Hearth, Left or Right 2
2MFP39-1A Hearth, Middle Left/Right 1
3MFP84-1 Hearth Filler 1
4MFP49-3A Side Wall W/Ø4 1
5MFP49-3 Side Wall 9
6 MFP39-2 Rear Wall 4
7MFP84-2 Rear Wall 4
8MFP84-4L Downdraft Diverter LH 1
9 MFP84-4R Downdraft Diverter RH 1
10 MFP84-4M Downdraft Diverter Middle 1
11 MFP84-6AL Lintel, Front Left 1
12 MFP84-6AR Lintel, Front Right 1
13 MFP108-6AM Lintel, Front Middle 2
14 MFP84-6 Lintel Left/Right 1
15 MFP84-6M Lintel Middle 1
16 NOT SUPPLIED ² Angle Iron 6" x 4" 1/2" x 93-1/4" 1
17 MFP49-7A Dome, Side - Lower 2
18 MFP84-5M Lower Dome Rear Center 2
19 MFP84-5S Lower Dome Rear Side 6
20 MFP96-10M Middle Dome Center Front-Rear 2
21 MFP108-10S Middle Dome Side 4
22 MFP49-8 Dome, Side, Upper 2
23 MFP49-7(B) Dome Side Top 2
24 MFP84-9T Dome Top 2
25 NOT SUPPLIED ² Anchor Plate Insulation or High-Temper-
ature Sealant
2
26 SOLD SEPARATELY114 Inch Damper/Anchor Plate 2
27 REBAR #3 Rebar (Ø3/8”) X 40” 8
28 MFP4-AK-M ¹ Outside Air Kit, 4" Dia 1
FOR COMBUSTIBLE FLOOR SYSTEMS
(Not shown)
29 NOT SUPPLIED ² CMU Blocks 8" x 8" x 16" 14
30 NOT SUPPLIED ² 1” Fiberglass Insulation Blanket 2
31 NOT SUPPLIED ² Cement Board 2
32 NOT SUPPLIED ² Assy, Floor Joist Brace 24
33 NOT SUPPLIED ² Allthread 1/2-13 X 12" 10
34 NOT SUPPLIED ² Allthread 1/2-13 X 10" 14
35 NOT SUPPLIED ² 1/2-13 Unc Hex Nut 48
MFP84-RGL FIREBOX PARTS LIST:
NOTE:
1 ITEMS NOTED ARE SOLD SEPARATELY.
2
ITEMS INDICATED AS “NOT SUPPLIED” CAN BE OBTAINED
FROM YOUR LOCAL HARDWARE STORE.

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10
PARTS LIST (Combustible & Non-Combustible Floor) Continued
2
2
1
1
3
4
5
6
6
6
6
6
6
6
6
7
7
7
7
8
9
12
17
18
18
18
18
18
19
19
20
24
24
20
21
21
20
20
18
11
27
16
22
23
26
25
16
28
22
23
11
15
5
10
13
13
14
MFP96-RGL FIREBOX PARTS LIST:
Note: If your installation is on combustible oor, the total
replace height will increase due to the addition of the
required CMU blocks, cement board & insulation blanket.
NOTE: See page 43, for CMU Block layout
Only approved non-combustible support structure must
be used when installing on combustible oor systems.
See Pages 24 thru 27 for combustible oor and framing
anchoring illustrations when using CMU blocks.

mason-lite.com 11
PARTS LIST (Combustible & Non-Combustible Floor) Continued
ITEM P/N Description QTY
1MFP39-1 Hearth, Left or Right 2
2MFP39-1A Hearth, Middle Left/Right 2
3MFP96-1 Hearth Filler 1
4MFP49-3A Side Wall W/Ø4 1
5MFP49-3 Side Wall 9
6 MFP39-2 Rear Wall 8
7MFP96-2S Rear Wall 4
8MFP96-4L Downdraft Diverter LH 1
9 MFP96-4R Downdraft Diverter RH 1
10 MFP96-4M Downdraft Diverter Middle 1
11 MFP108-6A Lintel, Front Left/Right 1
12 MFP96-6AM Lintel, Front Middle 1
13 MFP108-6 Lintel Left/Right 2
14 MFP96-6M Lintel Middle 1
15 NOT SUPPLIED ² Angle Iron 6" x 4" 1/2" x 105-1/4" 1
16 MFP49-7A Dome, Side - Lower 2
17 MFP96-5MA Lower Dome Rear Center 1
18 MFP108-5S Lower Dome Rear Side 6
19 MFP96-5M Lower Dome Rear-Front Center 2
20 MFP108-10S Middle Dome Side 4
21 MFP96-10M Middle Dome Center Front-Rear 4
22 MFP49-8 Dome, Side, Upper 2
23 MFP49-7(B) Dome Side Top 2
24 MFP96-9T Dome Top 2
25 NOT SUPPLIED ² Anchor Plate Insulation or High-Tempera-
ture Sealant
2
26 SOLD SEPARATELY114 Inch Damper/Anchor Plate 2
27 REBAR #3 Rebar (Ø3/8”) X 40” 8
28 MFP4-AK-M ¹ Outside Air Kit, 4" Dia 1
FOR COMBUSTIBLE FLOOR SYSTEMS
(Not shown)
29 NOT SUPPLIED ² CMU Blocks 8" x 8" x 16" 14
30 NOT SUPPLIED ² 1” Fiberglass Insulation Blanket 2
31 NOT SUPPLIED ² Cement Board 2
32 NOT SUPPLIED ² Assy, Floor Joist Brace 24
33 NOT SUPPLIED ² Allthread 1/2-13 X 12" 10
34 NOT SUPPLIED ² Allthread 1/2-13 X 10" 14
35 NOT SUPPLIED ² 1/2-13 Unc Hex Nut 48
MFP96-RGL FIREBOX PARTS LIST:
NOTE:
1 ITEMS NOTED ARE SOLD SEPARATELY.
2
ITEMS INDICATED AS “NOT SUPPLIED” CAN BE OBTAINED
FROM YOUR LOCAL HARDWARE STORE.

mason-lite.com
12
2
2
2
1
1
3
4
5
6
6
6
6
6
6
6
6
7
7
7
7
8
9
18
18
18
18
18
18
10
20
20
20
20
11
15
13
14
16
22
23 27
23
22
17
16
12
14
28
26
29
5
21
21
25
19
19 24
24
19
PARTS LIST (Combustible & Non-Combustible Floor) Continued
Note: If your installation is on combustible oor, the total
replace height will increase due to the addition of the
required CMU blocks, cement board & insulation blanket.
NOTE: See page 44, for CMU Block layout
Only approved non-combustible support structure must
be used when installing on combustible oor systems.
See Pages 24 thru 27 for combustible oor and framing
anchoring illustrations when using CMU blocks.
MFP108-RGL FIREBOX PARTS LIST:

mason-lite.com 13
MFP108-RGL FIREBOX PARTS LIST:
PARTS LIST (Combustible & Non-Combustible Floor) Continued
ITEM P/N Description QTY
1MFP39-1 Hearth, Left or Right 2
2MFP39-1A Hearth, Middle Left/Right 3
3MFP108-1 Hearth Filler 1
4MFP49-3A Side Wall W/Ø4 1
5MFP49-3 Side Wall 9
6 MFP44-2 Rear Wall 8
7MFP108-2-R/L Rear Wall 4
8MFP108-4L Downdraft Diverter LH 1
9 MFP108-4R Downdraft Diverter RH 1
10 MFP108-4M Downdraft Diverter Middle 1
11 MFP108-6AL Lintel, Front Left 1
12 MFP108-6AR Lintel, Front Right 1
13 MFP108-6AM Lintel, Front Middle 1
14 MFP108-6 Lintel Left/Right 2
15 MFP108-6M Lintel Middle 1
16 NOT SUPPLIED ² Angle Iron 6" x 4" 1/2" x 108-1/4" 1
17 MFP49-7A Dome, Side - Lower 2
18 MFP108-5S Lower Dome Rear Side 3
19 MFP108-5M Lower Dome Rear Center 6
20 MFP108-10S Middle Dome Side 4
21 MFP108-10M Middle Dome Center Front-Rear 2
22 MFP49-8 Dome, Side, Upper 2
23 MFP49-7(B) Dome Side Top 2
24 MFP108-9S Dome Top Side L/R 2
25 MFP108-9 Dome Top Middle 1
26 NOT SUPPLIED ² Anchor Plate Insulation or High-Tempera-
ture Sealant
3
27 SOLD SEPARATELY114 Inch Damper/Anchor Plate 3
28 REBAR #3 Rebar (Ø3/8”) X 40” 8
29 MFP4-AK-M ¹ Outside Air Kit, 4" Dia 1
FOR COMBUSTIBLE FLOOR SYSTEMS
(Not shown)
30 NOT SUPPLIED ² CMU Blocks 8" x 8" x 16" 16
31 NOT SUPPLIED ² 1” Fiberglass Insulation Blanket 2
32 NOT SUPPLIED ² Cement Board 2
33 NOT SUPPLIED ² Assy, Floor Joist Brace 24
34 NOT SUPPLIED ² Allthread 1/2-13 X 12" 10
35 NOT SUPPLIED ² Allthread 1/2-13 X 10" 14
36 NOT SUPPLIED ² 1/2-13 Unc Hex Nut 48
NOTE:
1 ITEMS NOTED ARE SOLD SEPARATELY.
2
ITEMS INDICATED AS “NOT SUPPLIED” CAN BE OBTAINED
FROM YOUR LOCAL HARDWARE STORE.

mason-lite.com
14
MFP120-RGL
FIREBOX PARTS LIST:
2
2
2
2
1
1
3
5
5
5 5
6
6
6
6
7
8
9
10
14
18
21
21
21
24
25
25
25
24
21
22
22
22
22
18
18
19
18
18
18
14
15
16
5
5
5 5
4
11
13
29
17
28
23
26
17
20
12
20
23
26
27
30
4
PARTS LIST (Combustible & Non-Combustible Floor) Continued
Note: If your installation is on combustible oor, the total
replace height will increase due to the addition of the
required CMU blocks, cement board & insulation blanket.
NOTE: See page 44, for CMU Block layout
Only approved non-combustible support structure must
be used when installing on combustible oor systems.
See Pages 24 thru 27 for combustible oor and framing
anchoring illustrations when using CMU blocks.

mason-lite.com 15
MFP120-RGL
FIREBOX PARTS LIST:
PARTS LIST (Combustible & Non-Combustible Floor) Continued
ITEM P/N Description QTY
1MFP39-1 Hearth, Left or Right 2
2MFP120-1 Hearth, Middle 4
3MFP49-3A Side Wall W/Ø4 1
4MFP49-3 Side Wall 9
5MFP44-2 Rear Wall 4
6 MFP49-2 Rear Wall 8
7MFP120-4L Downdraft Diverter LH 1
8MFP120-4R Downdraft Diverter RH 1
9 MFP108-4ML Downdraft Diverter Middle Left 1
10 MFP108-4MR Downdraft Diverter Middle Right 1
11 MFP120-6AL Lintel, Front Left 1
12 MFP120-6AR Lintel, Front Right 1
13 MFP120-6AM Lintel, Front Middle 1
14 MFP120-6 Lintel Left/Right 2
15 MFP120-6M Lintel Middle 1
16 NOT SUPPLIED ² Angle Iron 6" x 4" x 1/2" x 129-1/4" 1
17 MFP49-7A Dome, Side - Lower 2
18 LMFP120-5 Lower Dome Rear 6
19 MFP120-5MS Lower Dome Rear Center 2
20 MFP120-5ML Lower Dome Center 1
21 MFP120-10M Middle Dome Center Front-Rear 4
22 MFP120-10S Middle Dome Side 4
23 MFP49-8 Dome, Side, Upper 2
24 MFP49-7(B) Dome Side Top 2
25 MFP120-9S Dome Top Side L/R 2
26 MFP120-9 Dome Top Middle 3
27 NOT SUPPLIED ² Anchor Plate Insulation or High-Temperature
Sealant
3
28 SOLD SEPARATELY114 Inch Damper/Anchor Plate 3
29 REBAR #3 Rebar (Ø3/8”) X 40” 8
30 MFP4-AK-M ¹ Outside Air Kit, 4" Dia 1
FOR COMBUSTIBLE FLOOR SYSTEMS
(Not shown)
31 NOT SUPPLIED ² CMU Blocks 8" x 8" x 16" 18
32 NOT SUPPLIED ² 1” Fiberglass Insulation Blanket 2
33 NOT SUPPLIED ² Cement Board 2
34 NOT SUPPLIED ² Assy, Floor Joist Brace 24
35 NOT SUPPLIED ² Allthread 1/2-13 X 12" 10
36 NOT SUPPLIED ² Allthread 1/2-13 X 10" 14
37 NOT SUPPLIED ² 1/2-13 Unc Hex Nut 48
NOTE:
1 ITEMS NOTED ARE SOLD SEPARATELY.
2
ITEMS INDICATED AS “NOT SUPPLIED” CAN BE OBTAINED
FROM YOUR LOCAL HARDWARE STORE.

mason-lite.com
16
- All dimensions are in
inches.
- All vertical dimensions are
dry stack minimum. Mortar
thickness may add up to 1
inch to the overall height.
- Firebrick lining not shown.
FIREBOX DIMENSIONS
43”
28”
28”
75”
23-1/2”
81-1/4”
77-1/4”
66-3/4”
60-1/2”
14-1/4”30”
11”
4-1/4”
8”
4”
6”
DETAIL E
SECTION B-B
SECTION A-A
B
A
E
A
B
1/2”
40”
78”
6”
4”
36”
8”
28”
28”
23-1/2”
4-1/4”
10-7/8”
16-1/4”
72-1/2”
93-1/4”
78-3/4”
89-1/4”
1/2”
SECTION B-B
SECTION A-A
B
E
AA
B
DETAIL E
Figure 1
Figure 2
MFP72-RGL
MFP84-RGL

mason-lite.com 17
FIREBOX DIMENSIONS Continued
- All dimensions are in
inches.
- All vertical dimensions are
dry stack minimum. Mortar
thickness may add up to 1
inch to the overall height.
- Firebrick lining not shown.
75”
28”
28”
43”
16-1/4”
84-1/2”
36”
11”
4”
8”
6”
DETAIL E
SECTION B-B
SECTION A-A
1/2”
4-1/4”
23-1/2”
105-1/4”
90-3/4”
101-1/4”
B
A
E
A
B
40”
6”
8”
3”
28”
78”
23-1/2”
96-1/2”
11-1/4”
31-3/8”
31-3/8”27-3/8”
4-1/4”
1/2”
102-3/4”
113-1/4”
117-1/4”
DETAIL E
SECTION B-B
SECTION A-A
E
B
B
AA
14-1/4”
Figure 3
Figure 4
MFP96-RGL
MFP108-RGL

mason-lite.com
18
14-1/4”
11-1/4”
6”
8”
4”
3”
28”
46”
78”
35”
43”
40”
SECTION B-B
3”
4-1/4”
1/2”
23-1/2”
129-1/4”
31-1/2”31-1/2”
15-7/8”
109”
114-3/4”
125-1/4”
SECTION A-A
B
B
AA
Figure 5
MFP120-RGL
FIREBOX DIMENSIONS Continued
- All dimensions are in inches.
- All vertical dimensions are dry stack minimum. Mortar thickness may add up to 1 inch to the overall height.
- Firebrick lining not shown.

mason-lite.com 19
INTRODUCTION
Thank you for your purchase. We appreciate your
business!
Please read and understand these instructions before
installing or operating.
PRODUCT OVERVIEW
Mason-Lite Fireplaces are designed as factory-built blocks
to be assembled on-site and install on suitable combustible
or non-combustible oors.
Construction/Assembly Phases of a Mason-Lite
Fireplace:
- Planning and Site Selection
- Foundation or supporting Structure Preparation
-Firebox Assembly
-Venting Assembly
Careful step-by-step instructions for each phase of the
Instructions for each phase of the installation procedure
and operation of the Mason-Lite replace is detailed in
this manual. The installer and homeowner is required to
understand and comply with all information contained in
this manual.
ATTENTION:all illustrations in this manual are for general
reference only. Do not scale drawings. Actual design ele-
ments will vary from case to case.
PFS-TECO Corporation is the testing and listing agency for
Mason-Lite replaces.
ATTENTION: A residential building permit may be required
to install a Mason-Lite Fireplace. Consult local jurisdictions
before starting.
Note to Local Authorities and Inspectors: The Mason-Lite
Fireplaces are designed for installation per the National Fire
Protection Association Standard for Chimneys, Fireplaces,
Vents and Solid Fuel-Burning Appliances (NFPA211).
PRODUCT OVERVIEW
Figure 6 - Typical Installations
Internal
Wall
Installation Corner
Installation
Flush
Installation
Full
Projection
Installation

8"
MIN.
1' - 0"
MIN.
8"
MIN.
1' - 0"
MIN.
1' - 8"
MIN.
2" MIN.
FROM REAR AND SIDES
TO COMBUSTIBLES
HEARTH EXTENSION
NON-COMBUSTIBLE
FACING MATERIAL
mason-lite.com
20
PRE-INSTALLATION
To determine the safest and most e󰀩cient location for the
replace, consider the following:
1. The location must allow for proper clearances (see
Figures 7, 8, 9, 10, 11 and 12).
2. Select a location where replace will not be a󰀨ected by
drafts, air conditioning ducts, windows or doors.
3. Position replace to avoid cutting of joists or roof rafters.
4. Plan for combustion air inlet. (see page 28 for details).
SELECTING LOCATION Clearances 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 Flooring Plywood
Sub-Flooring Wood Framing Mill Board
Particle Board Plywood Paneling
Maintain the following clearances:
• Unit sides, rear, Dome sides, rear & top: 2” (51 mm)
• Combustible Floors: 8” (203 mm)
• Combustible Sheathing above of face opening top: 38” (965 mm)
• Sheathing or trim to face opening sides: 8” (203 mm)
• Mantel above face opening: (see Fig.11)
• Face opening to adjacent sidewall: 24” (610 mm)
• Hearth extension beyond front: 20” (508 mm)
• Hearth extension beyond sides of face: 12” (305 mm)
• Insulation from rebox: 2” (51 mm)
CLEARANCES
Clearances To Combustibles
FIREBOX FRAMING & CLEARANCES
Figure 7 Cross-sectional Top View
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.
Understanding Clearance to Combustibles
Considerable heat can build up on the outside surface of
replaces. Minimum clearance to combustibles must be
maintained.