Heatilator MEL36 User manual

1
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Installation and service of this replace should be
performed by qualied personnel. Hearth & Home
Technologies recommends NFI certied profes-
sionals, or technicians supervised by an
NFI certied professional.
WOODBURNING FIREPLACE
Manufactured Home Approved
Fire Risk.
WARNING
For use with solid wood fuel only.
Other fuels may overre and generate
poisonous gases (i.e. carbon monoxide).
Model(s):
Installation Manual
Installation and Fireplace Setup
WARNING
HOT SURFACES!
Glass and other surfaces are hot during
operation AND cool down.
Hot glass will cause burns.
• DO NOT touch glass until it is cooled
• NEVER allow children to touch glass
• Keep children away
• CAREFULLY SUPERVISE children in same room as
replace.
• Alert children and adults to hazards of high temperatures.
High temperatures may ignite clothing or other ammable
materials.
• Keep clothing, furniture, draperies and other ammable
materials away.
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
MEL36
MEL42
NOTICE: DO NOT discard this manual!
• DO NOT store or use gasoline or other am-
mable vapors and liquids in the vicinity of this
or any other appliance.
• DO NOT overre. Overring will void your
warranty.
• Comply with all minimum clearances to com-
bustibles as specied. Failure to comply may
cause house re.
WARNING: If the information in these
instructions is not followed exactly, a re
or explosion may result causing property
damage, personal injury, or death.

2Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Indicates practices which may cause damage to the replace or to property.
Table of Contents
1 Product Specic & Important Safety Information
A. Fireplace Certication 3
B. Non-Combustible Materials 3
C. Combustible Materials 3
2 Getting Started
A. Typical Fireplace System 4
B. Design and Installation Considerations 6
1. Selecting Fireplace Locations 6
2. Locating Fireplace & Chimney 6
C. Tools and Supplies Needed 6
D. Inspect Fireplace and Components 6
E. Fireplace System Requirements 6
3 Framing and Clearances
A. Fireplace Dimensions 7
B. Clearances 8
Minimum Clearances to Combustibles 8
C. Frame the Fireplace 9
D. Secure and Level the Fireplace 9
E. Protective Metal Hearth Strips 10
F. Install Outside Air Kit 10
4 Chimney and Termination Requirements
A. Chimney Requirements 11
B. Offsets/Returns 12
C. Termination Requirements 13
5 Chimney Installation
A. Typical Chimney System 14
B. Assemble Chimney Sections 15
C. Roof Penetration 15
D. Thimble Instalation 16
E. Install Ceiling Firestops 17
F. Install Attic Insulation Shield 18
G. Termination Cap Requirements 18
6 Finishing
A. Finishing Material 19
B. Hearth Extension, Building and Finishing 20
1.Hearth Extension 4” or more below replace
Opening 21
2. Hearth Extension less than 4” below replace 21
Opening
C. Non-Combustible Sealant Material 21
D. Mantel and Wall Projections 22
E. Sidewalls/Surrounds 23
7 Fireplace Setup
A. Gas Log/Lighter Provision 24
B. Wood Burning Inserts 24
8 Reference Materials
A. Chimney Components 25
B. Optional Components 27

This replace may be installed in manufactured homes,
except in sleeping rooms.
If installed with a gas log set, provisions for the National
Fuel Gas Code must be met.
This replace complies with the installation requirements
for HUD.
CAUTION! The structural integrity of the manufactured
home oor, wall, and celing/roof must be maintained.
Heatilator is a registered trademark of Hearth & Home
Technologies.
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Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
WARNING! Risk of Fire! Hearth & Home Technologies
disclaims any responsibility for, and the warranty and
agency listing will be voided by the following actions.
DO NOT:
• installoroperatedamagedreplace
• modifyreplace
• install other than as instructed by Hearth & Home
Technologies
• operate the fireplace without fully assembling all
components
• overre
• installunventedgaslogset
• installanycomponentnotapprovedbyHearth&Home
Technologies
• installpartsorcomponentsnotListedorapproved
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
installer, service agency or your dealer.
B. Non-Combustible Materials
• Materials which will not ignite and burn, composed of
any combination of the following:
- Steel - Iron
- Brick - Tile
- Concrete - Slate
- Glass - Plasters
• Materials reported as passing ASTM E 136, Standard
Test Method for Behavior of Materials, in a Vertical
Tube Furnace at 750° C
C. Combustible Materials
• Materials made of or surfaced with any of the following
materials:
- Wood - Compressed paper
- Plant bers - Plastic
- Plywood/OSB - Sheet rock (drywall)
• Any material that can ignite and burn; ame proofed or
not, plastered or un-plastered
1 Product Specic & Important Safety Information
A. Fireplace Certication
This replace system has been tested and listed in accor-
dance with UL 127 and ULC-S610 standards by Under-
writers Laboratories Inc. for installation and operation in
the United States and Canada.

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Non-combustible
roof flashing maintains
minimum clearance
around chimney
Additional lateral
support for chimney
above roof (or enclosed
in chase) if needed
Ceiling firestop
on floor of attic
Support straps
on rafter support
chimney (not shown)
Termination cap
Chimney penetrates roof
preferably without affecting
roof rafters
Offset & Return (with hanger straps)
Framing headed off
in ceiling joists
Enclosed space above
and around fireplace
Mantel and surround
Decorative facing
and trim
Hearth extension
Factory-built fireplace
Protective metal
hearth strip(s)
Outside
combustion air
Combustible framing/header
on top of V-shaped standoffs
Chimney system
Attic insulation shield or thimble
(not shown) must be used here to keep
insulation away from chimney
if attic is insulated
Storm Collar
Roof
Flashing
4Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
2 Getting Started
A. Typical Fireplace System
Figure 2.1 Typical Fireplace System *Glass doors not shown.
*Chimney Air Kit (not shown)
required in Canada

5
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
G
F
E
AC
Across a
corner
H
As a
room
divider
D
48 in.
(1219 mm)
minimum
A
Along a wall
A
B* 1/2 in. (13 mm) all
configurations
H
1/2 in. (13 mm) min. air
space from fireplace to
combustible materials.
Note:
* 8 in. (203 mm) extra space
included for outside air
connection. If outside air
duct has no bend, this
dimension may be reduced
as long as minimum
clearances are met.
Note: Measurements are FRAMING dimensions only and do
not include drywall either in the cavity or on the interior walls.
I
I
A B C D E F G H I
inches 42 50 67 7/ 8 59 1/ 2 34 14 48 21 1/ 2
mm 1067 1270 1724 1511 864 356 1219 546
inches 48 56 73 7/ 8 65 1/ 2 37 1/ 4 14 52 1/ 4 21 1/ 2
mm 1219 1422 1876 1664 946 356 1327 546
Model
12 in. (305 mm)
Minimum from FP
opening to any
perpendicular wall.
ME L36
ME L42
Figure 2.2 Fireplace Locations
NOTICE:
• Illustrationsandphotosreecttypicalinstallationsand
are FORDESIGNPURPOSESONLY.
• Illustrations/diagramsarenotdrawntoscale.
• Actualinstallation/appearancemayvaryduetoindividual
design preference.
• Hearth&HomeTechnologiesreservestherighttoalter
its products.
NOTICE: In addition to these framing dimensions, also
reference the following section:
• Clearances (Section 3).
B. Design and Installation Considerations
NOTICE: Check building codes prior to installation.
• Installation MUST comply with applicable local, regional,
state and national codes and regulations.
• Consult insurance carrier, local building inspector, re
ofcials or authorities having jurisdiction over restrictions,
installation inspection and permits.
• Before installing, determine the following:
- Where the replace is to be installed.
- The vent system conguration to be used.
- Gas supply piping.
- Electrical wiring.
- Framing and nishing details.
Note: A raised hearth extension built ush with the
replace opening or less than 4 in. (102 mm) below
the fireplace opening requires the fireplace be
installed on a non=combustible surface.
1. Selecting Fireplace Locations
This replace may be used as a room divider, installed
along a wall or across a corner. See Figure 2.2.
Locating the replace in a basement should be avoided.
Locating near frequently opened doors, central heat
outlets or returns, or other locations of considerable air
movement can affect the performance.
Outside air must be used for combustion. This replace
comes equipped with the necessary components. Con-
sideration should be given to these factors before decid-
ing on a location.

6Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
2. Locating Fireplace & Chimney
Location of the replace and chimney will affect perfor-
mance. To reduce spillage of combustion products into
the living space avoid:
• Install within the warm airspace enclosed by the building
envelope. This helps to produce more draft, especially
during lighting and die-down of the re.
• Penetrate the highest part of the roof. This minimizes
the effects of wind loading.
• Minimize the use of chimney offsets.
• Consider the replace location relative to oor and ceiling
and attic joists.
Negative pressure in the structure can cause spillage of
combustion products into the living space. To minimize
effects of negative pressure:
• Ensure adequate outdoor air for all combustion
appliances and exhaust equipment.
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the replace.
• Avoid installing the replace near doors, walkways or
small isolated spaces.
• Recessed lighting should be a “sealed can” design.
C. Tools and Supplies Needed
Before beginning the installation be sure the following
tools and building supplies are available:
Reciprocating saw Framing material
Pliers Non-combustible sealant
Hammer Gloves
Phillips screwdriver Framing square
Flat blade screwdriver Electric drill and bits
Plumb line Safety glasses
Level Tape measure
1/2-3/4 in. length, #6 or #8 self-drilling screws
Misc. screws and nails
D. Inspect Fireplace and Components
WARNING! Risk of Fire and/or Explosion! Damaged
parts could impair safe operation. DO NOT install dam-
aged,incompleteorsubstitutecomponents.Keepre-
place dry.
• Remove replace and components from packaging and
inspect for damage.
• Vent system components are shipped in separate
packages.
• Report to your dealer any parts damaged in shipment.
• Read all the instructions before starting the
installation. Follow these instructions carefully
during the installation to ensure maximum safety
and benet.
E. Fireplace System Requirements
The Heatilator replace system requirements consist of
the following:
• Fireplace
- Refractory (included with replace)
- Firescreen (included with replace)
- Grate (included with replace)
- Hearth Extension (required, sold separately)
- Glass Doors (included with replace)
• Outside Air System
- Air Inlet (included with replace)
- Flex (required, included with replace)
• Chimney System
- Chimney air kit (required in Canada, sold separately)
- Chimney termination cap (required, sold separately)
- MH Thimble Kit (required, sold separately)
• Non-combustible nish material

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Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
3 Framing and Clearances
A. Fireplace Dimensions
A
21 in.
(533 mm)
7.50 in.
(191 mm)
14.13 in.
(359 mm)
18.75 in.
(476 mm)
13.45 in.
(476 mm)
21 in.
(533 mm)
7.50 in.
(191 mm)
9.25 in.
(235 mm)
7.50 in.
(191 mm)
Gas
Knockout
Outside
Air
9.25 in.
(235 mm)
Gas
Knockout
7.50 in.
(191 mm)
39.50 in.
(1003 mm)
C
D
B
21.37 in.
(543 mm)
7.37 in.
(187 mm)
A B C D
in. 36 41 23.75 11.87
mm 914 1041 603 302
in. 42 47 29.75 14.87
mm 1067 1194 756 378
Model #
MEL36
MEL42
17.83 in.
(453 mm)
Figure 3.1 Fireplace Dimensions

8Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
tocombustiblesasspeciedinFigure3.2.DO NOT pack
required air spaces with insulation or other materials.
Framing or nishing material used on the front of, or in
frontof,thereplacecloserthantheminimumslistedmust
be constructed entirely of non-combustible materials (i.e.,
steel studs, concrete board, etc.). Failure to comply may
causere.
Figure 3.2 Clearances to Combustible Materials
Minimum Clearances to Combustibles
WITHIN ENCLOSURE AREA
Fireplace to backwall 1/2 in. (13 mm)
Fireplace to sidewall 1/2 in. (13 mm)
Top standoffs to header 0 in. (0 mm)
Door opening to sidewall 12 in. (305 mm)
MANTEL
Mantel minimum height 12 in. (25 mm) from
top of opening
Maximum mantel depth 12 in. (305 mm)
(roof)
(insulation)
0 in. to level
of standoffs
Thimble application shown
(ceiling)
(attic)
Storm Collar
Roof Flashing
1/2 in. (13 mm) to back &
sides of appliance
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
48 in.
1219 mm
Ceiling Firestop

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Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
B
C
A
2 in. (51 mm)
min. air space
clearance
from chimney.
Header MUST NOT be notched!
D
D = extra space needed for outside air connection.
If outside air duct has no bend, this dimension may be
reduced as long as minimum clearances are met.
Model A B* C** D
in. 42 21 1/ 2 39 3/ 4 8
mm 1067 546 1010 203
in. 48 21 1/ 2 39 3/ 4 8
mm 1219 546 1010 203
* If interior of chase will be drywalled, add the thickness to
this measurement.
** Adjust header height for a raised floor under fireplace.
ME L36
ME L42
C. Frame the Fireplace
NOTICE: Hearth extension design should be determined
before installation of replace.
Figure 3.3 shows a typical framing of the replace, assum-
ing combustible materials are used. All required clearanc-
es to combustibles around the replace must be adhered
to. See Figure 3.2. Any framing across the top of the re-
place must be above the level of the top standoffs.
The nished cavity depth must be no less than 21 1/2 in.
(546 mm) from the nished backwall to the outside of front
wall framing.
WARNING! Risk of Fire! Youmustcomplywithall
minimum air space clearances to combustibles. DO NOT
pack required air spaces with insulation or other materi-
als.
WARNING! Risk of Fire! Comply with all minimum clear-
ancesspecied.
• A minimum 1/2 in. (13 mm) air clearance must be
maintained at the back and sides of the fireplace
assembly.
• Chimneysectionsatanylevelrequirea2in.(51mm)
minimum air space clearance between the framing and
chimney section.
• ClearanceofRadiationShieldthimbletochimneyisset
at11/2in.(38mm)
CAUTION! RiskofCuts/Abrasions.Wearprotectivegloves
and safety glasses during installation. Sheet metal edges
are sharp.
WARNING! Risk of Fire! Prevent contact with sagging,
loose insulation.
• DO NOT install against vapor barriers or exposed
insulation.
• Secureinsulationandvaporbarriers.
• Provideminimumairspaceclearancesatthesidesand
backofthereplaceassembly.
D. Secure and Level the Fireplace
This replace may be placed on either a combustible or
noncombustible continuous at surface. Follow the instruc-
tions for framing in Section 3. Slide the replace into posi-
tion. Be sure to provide the minimum 1/2 in. air clearance
at the sides and back of the replace.
The replace should be positioned so the face of the non-
combustible material on the replace will be ush with the
face of the drywall on the walls.
Level the replace and shim as necessary.
The replace must be secured to the manufactured hous-
ing structure to prevent the replace from shifting during
transportation. This can be done by securing through the
nailing anges on the sides of the replace and tabs on the
bottom pan.
Figure 3.3 Framing the Fireplace
1/2 in.
(13 mm)
Fireplace must be set out
1/2 in. (13 mm) in front of
the face of the framing
material.
WARNING! Risk of Fire! Ahearthextensionbuiltush
withthereplaceopeningorlessthan4in.(102mm)
belowthereplaceopeningrequiresthereplacebe
installed on a non-combustible surface.
CAUTION! The structual integrity of the manufactured
housing oor, wall, ceiling and roof must be maintained.

10 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Protective metal strips are placed 2 in. (51 mm) under the
front of the fireplace and must extend beyond the front
and sides of fireplace opening by 2 in. (51 mm).
1 in. (25 mm)
overlap
Raised Platform
Floor
2 in.
(51 mm)
1 in. (25 mm) min.
overlap
2 in.
(51 mm)
Top piece must overlap
bottom piece
Figure 3.5 Protect the Front of an Elevated Platform
E. Protective Metal Hearth Strips
Figure 3.4 Position the Protective Metal Hearth Strips
• Locate the two protective metal hearth strips measuring
approximately 26 in. x 4 in. (660 mm x 102 mm) included
with this replace.
• Slide each metal strip 2 in. (51 mm) under front edge of
replace.
• Overlap strips in the middle of replace opening by 1 in.
(25 mm) minimum.
• Metal strips must extend beyond the front and sides
of the replace opening by at least 2 in. (51 mm),
Figure 3.4).
• Protect the front of a platform elevated above the hearth
extension with metal strips (not included with replace)
per Figure 3.5. See Section 7 for hearth extension
instructions.
WARNING! Risk of Fire! Protective metal hearth
strips MUST be installed on combustible surfaces. DO
NOT cover metal strips with combustible materials.
Sparksorembersmayigniteooring.
• Hearth extensions MUST be installed exactly as
specied.
Figure 3.6 Outside Air Installation
Outside Air
Plate
Assembly
2 Zip Ties
*Flexible Duct
(
((
(
(
(
(
(
)
)
)))
F. Install Outside Air Kit
• Outside air kit is required in a manufactured housing
replace installation.
• Keep duct runs short and straight to minimize restriction.
• A small dip is acceptable for a cold air trap.
• The outside air kit must be installed on the left side of
the replace.
• The inlet tube assembly provided can be installed
through the oor into a ventilated crawl space as shown
in Figure 3.6.
• An outside air hood is available to install through the side
of the house.
• The air duct may be run vertically terminate and at least
3ft. (.91m) below the top of the uppermost chimney
section.
CAUTION! Risk of Fire or Asphyxiation! DO NOT
drawoutsidecombustionairfromwall,oororceiling
cavity, or enclosed spaces such as an attic or garage.
 • DO NOT place outside air hood close to exhaust
vents or chimneys. Fumes or odor could be drawn
intotheroomthroughthereplace.
 • Locateoutsideairinlettopreventblockagefrom
leaves,snow/ice,orotherdebris.Blockages could
cause combustion air starvation.
*Use UL181 Class O or Class 1 rigid or exible duct-
ing.

11
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Ceiling Firestop
13 ft. (3.96m)
min. straight
6 ft (1.83 m) max.
unsupported chimney
above roof
39 1/2 in. (1003 mm)
Effective Height
Thimble application
shown
Figure 4.1 Chimney Requirements
NOTICE: Amaximumoftwopairsofoffsetsandreturns
may be used.
Minimum overall straight height 13ft 3.96 m
Minimumheightwithsingleoffset/
return
14.5ft 4.42m
Doubleoffset/returnminimumheight 20ft 6.1m
Maximum height 90ft 27.43m
Maximum chimney length between an
offset and return
20ft 6.1m
Maximum distance between chimney
stabilizers
35ft 10.67m
Maximum unsupported chimney
length between the offset and return
6 ft 1.83m
Maximum unsupported chimney
heightabovethereplace
35ft 10.67m
Maximum unsupported chimney
above roof
6 ft 1.83m
WARNING! Risk of Fire! Youmustmaintain2in.(51mm)
air space clearance to insulation and other combustible
materials around the chimney system. Failure to do so
maycauseoverheatingandre.
NOTICE: You must provide support for the pipe during
construction and check to be sure inadvertent loading has
notdislodgedthechimneysectionfromthereplaceorat
any chimney joint.
A. Chimney Requirements
Vertical distances are measured from the base of the
replace as shown in Figure 4.1.
4 Chimney and Termination Requirements
Table 4.2 Chimney Component Dimensions
Table 4.1 Chimney Requirements
HEIGHT OF CHIMNEY COMPONENTS in. mm
Chimney Stabilizer
SL3 4-3/4 121
Offsets/Returns
SL315 13-3/8 340
SL330 15-1/2 394
Chimney Sections*
SL306 4-3/4 121
SL312 10-3/4 273
SL318 16-3/4 425
SL324 22-3/4 578
SL336 34-3/4 883
SL348 46-3/4 1187
* Dimensions reect effective height.

12 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
B. Offsets/Returns
• Use an offset/return to bypass overhead obstructions.
• An offset and return can be used as a single entity or separated by chimney section(s).
WARNING! Risk of Fire! DO NOT useoffset/returnsgreaterthan30°.Chimneydraftwillberestrictedandcouldcause
overheatingandre.Secureoffsetswithscrews(nottoexceed1/2”/13mminlength)Securereturnswithstrapping.
Straight chimney sections may be secured with screws. Keep chimney sections from separating or twisting.
• Measure the shift needed to avoid the overhead obstruction. Refer to dimension A in Figure 4.2.
• Find the appropriate A dimension listed in Table 4.3. The B dimension coinciding with the A dimension measurement in
Table 4.3 represents the required vertical clearance needed to complete the offset/return.
• Read across the chart to nd the number of chimney sections/model numbers needed between the offset and return.
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 4.2 Chimney Offset/Return
Table 4.3 Offset Dimensions
Example:
Your “A” dimension from Figure 4.2 is 14-1/2 in. (368
mm). Using Table 4.3, the dimension closest to, but not
less than 14-1/2 in. (368 mm) is 14-1/2 in. (368 mm) us-
ing a 30° offset/return.
You determine from the table that you need 34-1/8 in.
(867 mm) (Dimension “B”) between the offset and re-
turn.
The chimney component that best ts your application is
one SL324.
15-degree 30-degree
SL306 SL312 SL318 SL324 SL336 SL348
A B A B
in. mm in. mm in. mm in. mm
1 5/8 41 13 3/8 340 3 5/8 92 15 1/2 394 ------
2 7/8 73 17 3/4 451 5 1/2 140 18 5/8 473 1 - - - - -
4 1/8 102 22 3/8 568 7 1/4 184 21 3/4 552 2 - - - - -
4 1/2 114 23 5/8 600 8 1/2 216 23 3/4 603 - 1 - - - -
5 3/4 146 28 1/4 718 10 1/4 260 27 686 1 1 - - - -
6 152 29 3/8 746 11 1/2 292 29 737 - - 1 - - -
7 1/4 184 34 864 13 1/4 337 32 1/8 816 - 2 - - - -
7 3/4 197 36 1/8 918 14 1/2 368 34 1/8 867 - - - 1 - -
8 3/4 222 39 3/4 1010 16 1/4 413 37 3/8 949 1 - - 1 - -
10 3/8 264 45 5/8 1159 19 1/4 489 42 1/2 1080 - - 2 - - -
10 5/8 270 46 3/4 1187 20 1/2 521 44 5/8 1133 - - - - 1 -
11 7/8 302 51 3/8 1305 22 1/4 565 47 3/4 1213 1 - - - 1 -
13 1/2 243 57 1/4 1454 25 1/4 641 52 7/8 1343 - - - 2 - -
13 3/4 349 58 3/8 1483 26 1/2 673 55 1397 -----1
15 381 63 1600 28 1/4 718 58 1/8 1476 1 - - - - 1
16 1/2 419 68 3/4 1746 31 1/4 794 63 1/4 1607 - 1 - - - 1
18 457 74 5/8 1895 34 1/4 870 68 1/2 1740 - - 1 - - 1
19 5/8 498 80 3/8 2042 37 1/4 946 73 3/4 1873 - - - 1 - 1
20 5/8 524 84 1/8 2137 39 1/8 994 76 7/8 1953 1 - - 1 - 1
22 3/4 578 91 7/8 2334 43 1/4 1099 84 1/8 2137 - - - - 1 1
24 610 96 1/2 2451 45 1/8 1146 87 1/4 2216 1 - - - 1 1
25 7/8 657 103 1/2 2629 49 1/4 1251 94 1/2 2400 -----2
Proper assembly of air-cooled chimney parts result in an overlap at chimney joints of 1-1/4 in. (32 mm). Effective
length is built into this chart.

13
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Slanted Roofs
Flat Roofs
Chimney must
extend 3 ft (.9 m)
above the roof
Chimney must extend 2 ft (.6 m)
above any portion of the roof or
adjacent structures within
10 ft (3 m) of the chimney
Chimney must
extend 3 ft (.9 m)
above the roof
Chimney must extend 2 ft (.6 m)
above any portion of the roof or
adjacent structures within
10 ft (3 m) of the chimney
C. Termination Requirements
• Install a cap approved and listed for this replace system.
• Locate cap where it will not become plugged by snow or other materials.
• Locate cap away from trees or other structures.
• The bottom of the termination cap must be at least 3 ft (.91 m) above the roof AND at least 2 ft (.61 m) above any portion
of roof within 10 ft (3.05 m).
Figure 4.3 Termination Cap Locations

14 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
5 Chimney Installation
A. Typical Chimney System
(roof)
(insulation)
Mobile Home
Thimble
(ceiling)
(attic)
Storm Collar
Roof Flashing
Must have 2 in. (51 mm)
minimum clearance
to header
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Thimble Extension
Chimney must extend
beyond combustible
roof structure
Maintain minimum
height of chimney
above roof
Additional
support for
tall chimneys
Install roof flashing
according to minimum
requirements
Maintain minimum
clearances to
combustibles as
specified
Offsets/returns
may not exceed
30° from vertical
Lock chimney
sections together
firmly to resist
movement
Ceiling firestops
are required where
chimney passes
through ceiling or
floor
Support straps for offsets
(not shown) must be
secured to adequate framing
Termination Cap
Storm Collar
Offsets/returns must be
secured with the screws
provided (outer pipe only)
Attic shield
Figure 5.1 Typical Chimney System - Thimble Application
Figure 5.2 Typical Chimney System - Attic Shield Application

15
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
Ceiling
Firestop
Straps
Optional
Additional
Support
Joint
Band
(Optional)
Figure 5.4 Secure the Chimney
Figure 5.3 Assembling Chimney Sections
• Support the pipe during construction and check to be
sure inadvertent loading has not dislodged the chimney
section from the replace or at any chimney joint.
• Attach a straight chimney section or an offset to the top
of the replace.
• Place inner ue to the inside of the chimney section below
it. Place the outer casing outside the outer casing of the
chimney section below it. Refer to Figure 5.3.
NOTICE: Chimney sections cannot be disassembled
once locked together. Plan ahead!
• Lock chimney sections and/or offsets/returns together by
pushing downward until the top section meets the stop
bead on the lower section.
• Pull on the top section to make sure it is fully engaged
and will not separate.
• You may use #6 or #8 sheet metal screws no longer than
1/2 in. (13 mm) to fasten chimney sections together. Do
NOT penetrate inner ue.
WARNING! Risk of Fire! YouMUSTusescrewstofas-
tenoffset/returnstochimneysectionstokeepthechim-
ney parts from twisting. Failure to do so could cause
re.
• Fasten offset/returns to chimney sections. Insert the
screws through the predrilled holes. Do NOT penetrate
inner ue.
• Secure chimney returns with hanger straps provided;
fasten to studs or joists.
• Vertical straight runs of chimney must be supported every
35 ft (10.7 m).
B. Assemble Chimney Sections
WARNING! Risk of Fire! DO NOT install substitute or
damaged chimney components.
• Useonlythosecomponentsdescribedinthismanual.
Substitute or damaged chimney components could impair
safeoperationandcauseoverheatingandre.
C. Roof Penetration
• Refer to Figure 5.5.
• Plumb from roof to center of chimney.
• Drive a nail up through roof to mark center of pipe.
• Measure to either side of nail and mark the 14-1/2 in. x
14-1/2 in. (368 mm x 368 mm) opening required.
• Measure opening on the horizontal; actual length may
be larger depending on roof pitch.
• Cut out and frame opening.
• Refer to local codes for roof framing details.
Figure 5.5 Ceiling/Attic Construction

16 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
ATTIC INSULATION SHIELD NOT REQUIRED WHEN
THIMBLE APPLICATION IS USED.
• The thimble must extend completely through the roof
structure shielding combustible materials. Five location
holes have been provided to allow for a variety of ceiling/
roof thicknesses. The thimble extension is required
when the ceiling/roof thickness exceeds 12 1/2 in. The
extension should overlap the thimble 1 in.
• Drill 1/8 in. holes through the outer shield of the thimble
using the predrilled holes in the extension as guides.
Attach the extension to the thimble using the screws
provided with the extension.
• Install the thimble assembly and nail/screw it securely
to the framing members.
• Center the ashing over the chimney and fasten it
appropriately to the roof using nails or screws. Keep gaps
between the ashing plate and the roof to a minimum.
• Caulk the ashing plate and roof junction as well as the
vertical seam on the ashing. All nail/screw heads must
be caulked with a roong sealant.
• Finish assembling the chimney, storm collar and
termination cap following the installation instructions
provided with them.
D. Thimble Installation
NOTE: Roongshinglesmustbebelowtheashingplate
onthelowersideofaslopedroofandovertheashing
plate on the sides and top.
Figure 5.6 MH Installation

17
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
ROOM ABOVE (non-insulated ceiling)
ATTIC ABOVE (insulated ceiling)
B
A
Ceilng firestop
attached to bottom
of framing
Ceiling firestop
attached to top of
framing
Note: Use same dimensional lumber for framing
ceiling firestop and joists.
2 in. (51mm)
clearance
2 in. (51mm)
clearance
WARNING! Risk of Fire! DO NOT seal area between
restopopeningandchimneypipeexceptwheretheyen-
ter the attic or leave the warm air envelope of the home
(use600°Fsealant).
Figure 5.7 Installing the Ceiling Firestop
E. Install Ceiling Firestops
CAUTION! Risk of Fire! Ceilingrestopsmustbeused
wheneverthechimneypenetratesaceiling/oor.
• Theceilingrestopslowsspreadofreandreduces
coldairinltration.
• Install a ceiling restop whenever chimney penetrates
ceiling/oor.
• Mark and cut an opening in ceiling as shown in Figure 5.7.
• Frame the opening with the same size lumber used in
the ceiling joists.
• Nail the ceiling restop to the bottom of the ceiling joists
when there is a room above.
• Use an attic insulation shield if the ceiling is insulated.
The ceiling restop may then be attached above or below
the joists.
If the attic space is ventilated and the replace system
height from oor to the ue outlet of the termination is 13’6’’
or more, it is not necessary to use the Thimble and extend
the radiation shield into the roof ashing. The installation
can be done as a normal residential installation using the
standard restop attic shield.
Installation of a ceiling restop is required:
• Refer to Figures 5.7, 5.9, 5.10.
• Roll the shield (around the chimney if already installed).
The three holes on each side will match up (large holes
on top).
• Insert three screws into the matching holes to form a
tube.
• Bend the tabs on the bottom of the tube inward to 90° to
maintain chimney air space.
• Rest the insulation shield on the ceiling restop below.
• Bend the tabs at the top of the shield inward to 90° to
maintain the 2 in. (51 mm) air space from the chimney.
F. Attic Insulation Shield Installation
WARNING! Risk of Fire! YouMUSTinstallanatticinsu-
lation shield when there is any possibility of insulation or
other combustible material coming into contact with the
chimney.
THIMBLE APPLICATION NOT REQUIRED WHEN ATTIC
INSULATION SHIELD IS USED.
• DO NOT pack insulation between the chimney and the
attic insulation shield.
• Failuretokeepinsulationandothermaterialsawayfrom
chimneypipecouldcausere.
• DO NOT offset chimney inside insulation shield.
Catalog #
A B
in. mm in. mm
FS338 14-1/2 368 14-1/2 368
FS339 14-1/2 368 18-3/8 467
FS340 14-1/2 368 23 584

18 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
G. Termination Cap Installation
• Install a cap approved and listed for this replace system.
• The bottom of the termination cap must be at least 3 ft
(.91 m) above the roof AND at least 2 ft (.61 m) above
any portion of roof within 10 ft (3.05 m).
If you wish to make a custom shield or barrier, follow
these guidelines:
• Metal is preferred, although any material stiff enough to
hold back the insulation can be used.
WARNING! Risk of Fire! Use of cardboard or other
materialsthatcandeectunderhumidityorotherenvi-
ronmental conditions is not recommended.
• The shield or barrier must be tall enough to extend
above the insulation and prevent blown-in insulation from
spilling into the cavity.
• Maintain specied air spaces around chimney.
• Check instructions and local codes for further details.
Double-check the Chimney Assembly
Continue assembling the chimney sections up as need-
ed. While doing so, be aware of the height and unsup-
ported chimney length limitations given under Section
4.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the suc-
ceeding sections. If they have been connected correct-
ly, they will not disengage when tested.
Insert three
screws
Tabs bent 90°
Figure 5.8 Prepare Attic Insulation Shield
Figure 5.9 Install Attic Insulation Shield (restop above ceiling)
Figure 5.10 Install Attic Insulation Shield (restop below ceiling)
Tabs
bent in 90°
and taped
Tabs bent 90° to
rest against pipe
Attic Insulation Shield
Ceiling Firestop
10-1/2 in.
(267 mm)
14-1/2 in. (368 mm)
diameter
InsulationInsulation
Pipe
Pipe
2 in. (51 mm)
air space
Tabs
bent in 90°
and taped
Tabs bent 90° to
rest against pipe
Attic Insulation Shield
Ceiling Firestop
10-1/2 in.
(267 mm)
14-1/2 in. (368 mm)
diameter
InsulationInsulation
Pipe
Pipe
2 in. (51 mm)
air space

19
Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
6 Finishing
A. Finishing Material
Refer to Sections 1.B. and Sections 1.C. for combustible/
non-combustible materials. Refer to Figure 6.1 for non-
combustible zone.
WARNING! Risk of Fire! Youmustmaintainclear-
ances.
• DO NOTcovermetalreplacefrontwithcombustible
materials.
• Install combustible materials only to specified
clearances on top front and side edges.
• DO NOT place header or combustible framing below
top standoffs.
• Complete framing and apply facing material (drywall)
over framing.
• Facing material can butt up to metal face and columns
of replace.
• Only non-combustible materials may be used to cover
the metal replace front.
• A bead of 300-deg F minimum non-combustible sealant
must be used to close off any gaps at the top and sides
between the replace and facing to prevent cold air leaks.
Metal strips are placed 2 in. (51 mm)
under the front of the fireplace and must
extend beyond the front and sides of
fireplace opening by 2 in. (51 mm)
Continuous,
non-combustible sealant
Floor constructed of wood or
other combustible material
1/2 in. Micore
or equivilent
insulation
Hearth
Refractory
Finished combustible wall
Combustible material
Non-combustible
decorative facing
2 x 4 header, flush with
front of stand-offs
Tile, stone or other
non-combustible material
Flat 2 x 4 stud wall
Figure 6.2 Decorative Facing
These surfaces
may be covered
with non-combustible
material. Non-combustible
sealant.
Figure 6.1 Non-combustible Facing

20 Heatilator • MEL36, MEL42 Installation Manual • 4044-212 • Rev D • 01/06/15
B. Hearth Extension, Building and Fin-
ishing
Table 6.1
R = 1/k x inches of thickness
Table 6.2
WARNING! Risk of Fire! High temperatures, sparks,
embersorotherburningmaterialfallingfromthere-
place may ignite ooring or concealed combustible
surfaces.
• ProtectivemetalhearthstripsMUSTbeinstalled.
• Hearth extensions MUST be installed exactly as
specied.
A hearth extension must be installed with all re-
places to protect the combustible oor in front of the
replace from both radiant heat and sparks.
• You MUST use a hearth extension with this
replace.
• Refer to Figure 6.3 for minimum dimensions of
combustible material.
• This replace has been tested and approved for use
with a hearth extension insulated to a minimum R
value of 1.03.
• The hearth extension material MUST be covered
with tile, stone or other non-combustible material.
• Manufactured hearth materials will usually have a
published R value (resistance to heat) or k value
(conductivity of heat). Refer to the formula in Table
6.1 to convert a k value to an R value,
• Refer to Table 6.2 for hearth extension insulation
alternatives.
WARNING! Risk of Fire!
• Maintainclearances.
• Framingornishingmaterialusedonthefrontofthereplace
closer than the minimums listed, must be constructed entirely
of non-combustible materials (i.e., steel studs, concrete board,
etc.).
Figure 6.3 Minimum Non-Combustible Hearth Extension Dimensions
B
A
C
C
D
Hearth Extension Insulation Alternatives, R Value = 1.03
Material
k per inch
thick
r per inch
thick
Minimum
thickness
required
Hearth & Home HX3, HX4 0.49 2.06 1/2 in.
USG Micore 300™ 0.49 2.06 1/2 in.
USG Durock™ Cement Board 1.92 0.52 2 in.
Cement Mortar 5.0 0.20 5 1/8 in.
Common Brick 5.0 0.20 5 1/8 in.
Ceramic Tile 12.50 0.08 12 1/4 in.
Armstrong™ Privacy Guard Plus 0.46 2.18 1/2 in.
Marble 14.3-20.0 0.07-0.05 14 5/8 in. - 20 3/8 in.
Model # A B C D
MEL36 in. 36 52 8 16
mm 914 1321 203 406
MEL42 in. 42 66 12 20
mm 1067 1676 305 508