Heatilator BIR42-B User manual

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 1
WOODBURNING FIREPLACE
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.
BIR36-B
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.
Installation and service of this appliance should be performed by
qualified personnel. Hearth & Home Technologies recomends HHT
Factory Trained or NFI certified professionals.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/232
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 4
B. Non-Combustible Materials 4
C. Combustible Materials 4
2 Getting Started
A. Typical Fireplace System 5
B. Design and Installation Considerations 6
1. Selecting Fireplace Locations 6
2. Locating Fireplace & Chimney 7
C. Tools and Supplies Needed 8
D. Inspect Fireplace and Components 8
E. Fireplace System Requirements 8
3 Framing and Clearances
A. Appliance Dimensions/Weight 9
B. Clearances 10
Minimum Clearances to Combustibles 10
C. Construct the Chase 11
D. Frame the Fireplace 12
E. Secure and Level the Fireplace 13
F. Protective Metal Hearth Strips 14
G. Outside Air Kit 14
4 Chimney and Termination Requirements
A. Chimney Requirements 16
B. O󰀨sets/Returns 17
C. Termination Requirements 18
5 Chimney Installation
A. Typical Chimney System 19
B. Assemble Chimney Sections 20
C. Install Chimney Air Kit 20
D. Secure O󰀨set/Return 21
E. Install Ceiling Firestops 21
F. Install Attic Insulation Shield 22
G. Roof Penetration 23
H. Install Chase/Chase Top 23
I. Termination Cap Requirements 24
J. Install Termination Cap 24
6 Shrouds
A. Radiation Shield 26
B. Field Constructed Shrouds 26
1. Open Top Shroud 26
2. Mailbox Style Shroud 27
3. Roofed Style Shroud 27
7 Finishing
A. Finishing Material 28
B. Hearth Extension, Building and Finishing 30
1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening 31
2. Raised Hearth Extension and Raised Fireplace 32
3. Fireplace Opening and Hearth Extension Flush
with the Floor 32
C. Non-Combustible Sealant Material 33
D. Mantel and Wall Projections 33
E. Sidewalls/Surrounds 34
8 Fireplace Setup
A. Install Hearth Molded Brick Panel 35
B. Install Back Molded Brick Panel 35
C. Install Side Molded Brick Panel 35
D. Install Screens 36
E. Install Mortar (Optional) 36
F. Grate 36
G. Gas Log/Lighter Provision 37
H. Wood Burning Inserts 37
9 Reference Materials
A. Chimney Components 38
B. Optional Components 42
►

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 3
Customer:
Lot/Address
Model (circle one): BIR36-B
Fireplace Install YES IF NO, WHY?
Protective hearth strips installed per manual requirements. (Pg. 14)
Outside air kit installed. (Pg 15)
Chimne
y
Section 4 & 5 (Pg. 16)
Attic insulation shield installed.
Shrouds Section 6 (Pg. 26)
Shroud is installed properly per instructions.
Finishing Section 7 (Pg. 28)
WARNING! Risk of Fire or Explosion! Failure to install fireplace acording to these instructions can lead to a fire or
explosion.
Verified that the chase is insulated and sealed. (Pg. 11)
Verified clearances to combustibles. (Pg. 10)
Fireplace is leveled and secured. (Pg. 13)
Hearth extension size/height decided. (Pg. 30)
Chimney configuration complies with diagrams.
Chimney installed, locked and secured in place with proper clearance.
Chimney air kit installed.
Firestops installed.
ATTENTION INSTALLER:
Follow this Standard Work Checklist
This standard work checklist is to be used by the installer in conjuction with, not instead of, the instructions contained in this installation
manual.
Date Installed:
Location of Fireplace:
Installer:
Dealer/Distributor Phone #
Serial #:
Roof flashing installed.
Terminations installed.
Combustible materials not installed in non
-
combustible areas
Hearth extension installed per manual requirements.
Fireplace Setup Section 8 (Pg. 35)
Hearth & Home Technologies recommends the following:
Comments communicated to party responsible
4059-711 • Rev C • 3-25-13
Verified all clearances meet installation manual requirements.
Mantels and wall projections comply with installation manual requirements.
All packaging and protective materials removed.
Optional doors properly installed.
Molded brick panels installed correctly.
Grate is properly installed.
Firescreen installed properly.
__________________________ by ______________________on _________
(Builder/Gen. Contractor) (Installer) (Date)
Comments: Further description of the issues, who is responsible (Installer/Builder/Other Trades, etc.) and corrective action needed:
Manual bag and all of its contents are removed from the fireplace and given to the party
responsible for use and operation.
• That this checklist remain visible at all times on the fireplace until the installation is complete.
• Photographing the installation and copying this checklist for your file.
Combustible materials not installed in non
-
combustible areas
.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/234
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 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 Metals, 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
11 Product Specic & Important Safety Information
A. Fireplace Certication
WARNING: This product and the fuels
used to operate this product (wood and
wood pellets), and the products of com-
bustion of such fuels, 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 information go to: www.P65Warn-
ings.ca.gov.
This replace system has been tested and listed in accor-
dance with UL127 Standards by Underwriters Laborato-
ries Inc. for installation and operation in the United States.
This replace may be installed in sleeping rooms. This
replace is not approved for manufactured housing. If in-
stalled with a gas log set, provisions for the National Fuel
Gas Code must be met.
This replace has been tested and listed for use with the
optional components specied in this manual. These op-
tional components may be purchased separately and in-
stalled at a later date. Installation of an outside air kit will
require signicant reconstruction and is best if installed at
the time of replace installation.
Heatilator is a registered trademark of Hearth & Home
Technologies.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 5
22 Getting Started
A. Typical Fireplace System
Figure 2.1 Typical Fireplace System
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 supports
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)
Combustible
framing/header
on top of
V-shaped
standoffs
(spacers)
Chimney system
Attic insulation shield must
be used here to keep insulation away
from chimney if attic is insulated
Storm Collar
Outside Air
(both sides)

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/236
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).
NOTICE:
A minimum 1-1/2 in. air clearance at the back and
a minimum 1-1/2 in. air clearance to the sides of
thereplaceassemblymustbemaintained.
Chimney sections at any level require a 2 in. mini-
mum air space clearance between the framing
and chimney sections.
B. Design and Installation Considerations
NOTICE: Check building codes prior to installation.
• Installation MUST comply with local, regional, state and
national codes and regulations.
• Consult insurance carrier, local building inspector, re
o󰀩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.
- Whether optional accessories - devices such as a
fan, wall switch or remote control - are desired.
1. Selecting Fireplace Locations
This replace may be used as a room divider, installed
along a wall, across a corner or used in an exterior chase.
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 a󰀨ect the performance.
A*
F
D
BC
1/2 in. (13 mm) all
configurations
1-1/2 in. min. air space
from fireplace to
combustible materials.
1/2 in. min. air space at
nailing flanges.
Note:
In an exterior chase
or projecting into a
garage
Across a
corner
As a
room
divider Along a wall
78 in.
(1981 mm)
G
B
E
48 in.
(1219 mm)
MINIMUM
24 in. (610 mm)
from fireplace opening to
any perpendicular wall
A
B
G
G
B
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Model # A B C D E F G
in. 72 47 7/8 89 1/8 44 5/8 20 3/8 63 1/8 28 1/2
mm 1829 1216 2264 1133 518 1603 724
BIR36
* 12 in. (305 mm) extra space
included for each outside air
connection. If outside air duct
has no bend, this dimension
may be reduced as long as
minimum clearances are met.
Consideration should be given to these factors before
deciding on a location.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 7
2. Locating Fireplace & Chimney
Location of the replace and chimney will a󰀨ect perfor-
mance.
• 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.
• Installing the replace in a basement is not recommended.
• Penetrate the highest part of the roof. This minimizes
the e󰀨ects of wind loading.
• Locate termination cap away from trees, adjacent
structures, uneven roof lines and other obstructions.
• Minimize the use of chimney o󰀨sets.
• Consider the replace location relative to oor and ceiling
and attic joists.
• Take into consideration the termination requirements in
Section 5.
Marginal Location:
• Below peak
Location NOT recommended:
• Not the highest point of the roof
• Wind loading possible
Multi-level Roofs
Windward
Leeward
Recommended Location:
• Above peak
Recommended:
• Insulated exterior chase
in cooler climates
Recommended Location:
• Above peak
• Inside heated space
Location NOT recommended:
• Too close to tree
• Below adjacent structure
• Lower roof line
• Avoid outside wall
Marginal Location:
• Wind loading possible
Not recommended in basement due
to high negative pressure concerns
that effect draft
Figure 2.3 Recommended Chimney Locations
• Install the outside air kit with the intake facing prevailing
winds during the heating season.
• 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.
• Attic hatches weather stripped or sealed.
• Attic mounted duct work and air handler joints and seams
taped or sealed.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/238
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 and doors 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
- Molded brick panels (hearth panel Included with
replace, side and back panels sold separately)
- Firescreen (included with replace)
- Hearth Extension (sold separately)
- Grate (included with replace)
• Outside Air System
- Air Inlet Hood x2 (included with replace)
- Flex (required, sold separately
• Chimney System
- Attic insulation shield (included with replace)
- Chimney termination cap (sold separately)
• Non-combustible nish material

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 9
74 1/8 in.
(1883 mm)
3 3/4 in.
(95 mm)
70 3/4 in.
(1797 mm)
67 3/8 in.
(1711 mm)
61 7/8 in.
(1572 mm)
54 in.
(1372 mm)
38 in.
(965 mm)
5 1/2 in.
(140 mm)
5 in.
(129 mm)
16 1/8 in.
(408 mm)
6 7/8 in.
(175 mm)
11 1/8 in.
(282 mm)
Gas Line
Knockout
11 in.
(281 mm) diameter
11 in.
(281 mm)
27 1/2 in.
(699 mm)
15 1/2 in.
(394 mm)
31 1/8 in.
(790 mm)
74 ° TYP.
5 in.
(129 mm)
16 1/8 in.
(408 mm)
11 1/8 in.
(282 mm)
6 7/8 in.
(175 mm)
46 7/8 in.
(1191 mm)
36 in.
(914 mm)
Gas Line
Knockout
Outside Air
Outside Air
33 Framing and Clearances
A. Appliance Dimensions/Weight
Figure 3.1 Fireplace Dimensions
Model Pounds
BIR36-B 251
Appliance Weight Table

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2310
(insulation)
Attic
Insulation
Shield
(ceiling)
(roof)
(attic)
(ceiling)
Ceiling Firestop
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
1-1/2 in. (38 mm) to back &
sides of appliance
(except at nailing flanges
where it is 1/2 in. [13 mm])
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
48 in.
1219 mm
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 1-1/2 in. (38 mm)
Fireplace to sidewall 1-1/2 in. (38 mm)
Top stando󰀨s to header 0 in. (0 mm)
Door opening to sidewall 24 in. (610 mm)
MANTEL
Mantel minimum height 22 in. (559 mm)
above opening
Maximum mantel depth 12 in. (305 mm)

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 11
C. Construct the Chase
A chase is a vertical boxlike structure built to enclose the
replace and/or its vent system. Vertical chimneys that
run on the outside of a building must be installed inside a
chase.
In cold climates, Hearth & Home Technologies recom-
mends that the chase be well insulated using batt type
insulation between the joists.
Construction of the chase may vary with the type of build-
ing. These instructions are not substitutes for the require-
ments of local building codes. Local building codes MUST
be checked.
Chases should be constructed in the manner of all outside
walls of the home to prevent cold air drafting problems.
The chase should not break the outside building envelope
in any manner. All outer walls need to be insulated.
Building codes require false ceiling and ceiling restops/
attic shields at each oor of the chase or every 10 ft (3048
mm) of clear space to control spread of re.
Walls, ceiling, base plate and cantilever oor at the rst
level of the chase should be insulated (see Figure 3.3.)
Vapor and air inltration barriers should be installed in the
chase as per regional codes for the rest of the home. Ad-
ditionally, Hearth & Home Technologies recommends that
the inside surfaces be drywalled and taped (or the use of
an equivalent method) for maximum air tightness.
Holes and other openings should be caulked with high
temperature caulk or stu󰀨ed with unfaced ber glass
insulation.
Ceiling
Firestop
Metal Chase Top
Round Termination Cap
False Ceiling
Insulation in the
outside walls
of the chase
Attic
Insulation
Shield
Chimney
Ceiling
Firestop
Tabs
False Ceiling
False Ceiling
Insulation
Insulation
Storm Collar
Figure 3.3 Chase Assembly
1 2 3
All outside walls should be insulated.
Figure 3.4 Chase Constructions
1. Fireplace and chimney enclosed in an exterior chase.
2. Chimney o󰀨set through exterior wall and enclosed in chase.
3. Chase constructed on roof.
• The chase is constructed using framing materials much
the same as the walls in your home. A variety of siding
materials may be used including brick, stone, veneer
brick, or standard siding materials.
• In constructing the chase, several factors must be
considered:
- Maintain a 2 in. (51 mm) air space around the
chimney.
- The chase top must be constructed of non-
combustible material.
- In cold climates, a restop spacer and attic insulation
shield should be installed in an insulated false ceiling
at the 8 ft. (2438 mm) level above the replace
assembly. This reduces heat loss through the chase.
- In cold climates, the walls of the chase should be
insulated to the level of the false ceiling as shown in
Figure 3.3. This will help reduce heat loss from the
home around the replace.
WARNING! You must install false ceilings and ceil-
ing restops at each oor of the chase or every 10 ft
(3.05 m) to control spread of re.
WARNING! Risk of Fire! DO NOT sealareabetweenre
stop opening and chimney pipe except where they enter
the attic or leave the warm air envelope of the home (use
600° F sealant).
WARNING! Risk of Fire! You must maintain a minimum
2 in. (51 mm) air space clearance to insulation and other
materials surrounding the chimney system.
• Insulationandothermaterialsmustbermlysecuredto
prevent accidental contact with chimney system.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
makingcontactwithreplaceorchimney.
• Failure to prevent contact between insulation or other
materials and chimney system may cause overheating
andre.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2312
B
C
A
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.
D
A B * C ** D
in. 47 7/8 28 1/2 74 1/4 12
mm 1216 724 1886 305
Model #
* If interior of chase will be drywalled, add the thickness to this measurement.
** Adjust header height for raised floor under fireplace.
BIR36
Framing must be extended straight up 84 in.
(2134 mm) from the base of the fireplace.
17 in.
(432 mm)
framing 1/2 in.
(13 mm)
Fireplace must be set out
1/2 in. (13 mm) in front of
the face of the framing
material.
D. Frame the Fireplace
NOTICE: Hearth extension design must be determined
before installation of replace.
If the replace is placed on the oor, the maximum height
of a nished raised hearth is 3-3/4”, if you want a higher
raised hearth the replace must be placed on a platform.
Figure 3.5 shows a typical framing (using 2 x 4 lumber) of
the replace, assuming combustible materials are used.
All required clearances to combustibles around the re-
place must be adhered to. See Figure 3.2. Any framing
across the top of the replace must be above the level of
the top stando󰀨s. (No recess above stando󰀨s.)
The nished cavity depth must be no less than 28-1/2 in.
(673 mm) from the nished backwall to the outside of front
wall framing. Framing must extend straight up all the way
to the ceiling.
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 1-1/2 in. (38 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.
CAUTION! Risk of Cuts/Abrasions. Wear protective gloves
and safety glasses during installation. Sheet metal edges
are sharp.
Figure 3.5 Framing the Fireplace
Note: Before framing up the chase, consider where
and how the chimney will run. If there are obstacles
that might be in the way, it may be necessary to make
the chase larger than shown to allow o󰀨sets to be used.
Refer to o󰀨set chart on page 17.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 13
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.
E. Secure and Level the Fireplace
This replace may be placed on either a combustible or
noncombustible continuous at surface. Slide the replace
into position. Be sure to provide the minimum 1-1/2 in.
air clearance at the sides and 1-1/2 in. at the 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.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2314
1 in. (25 mm) overlap
Minimum
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).
Raised Platform
Floor
2 in.
(51 mm)
1 in. (25 mm) min.
overlap
2 in.
(51 mm)
Top piece must overlap
bottom piece
Figure 3.7 Protect the Front of an Elevated Platform
F. Protective Metal Hearth Strips
Figure 3.6 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 3.6).
• Protect the front of a platform elevated above the hearth
extension with metal strips (not included with replace)
per Figure 3.7. See Section 6 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.
WARNING! Risk of re! High temperatures, sparks,
embers or other burning material falling from the
replacemayigniteooringorconcealedcombustible
surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specied.
G. Outside Air Kit (Required on both sides)
Outside air kits must be used for combustion and to pro-
vide cooling air to prevent overheating. Hearth & Home
Technologies recommends you utilize the shortest duct run
to optimize the performance of the outside air kit and in-
stall a P-Trap (see Figure 3.10). The outside air inlet hoods
should be positioned in a manner that will not allow snow,
leaves, etc. to block the inlet. In some installations the air
duct may need to be run vertically. In such an installation,
a 3 ft (914 mm) height di󰀨erence must be maintained from
the top of the uppermost chimney section to the outside air
inlet hoods.
Note: Maximum length is 40 feet.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 15
3 ft min. from
top of uppermost
chimney section
to air inlet.
CAUTION! Risk of Cuts/Abrasions. Wear protective
gloves and safety glasses during installation. Sheet metal
edges are sharp.
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 inlet hood close to exhaust
vents or chimneys. Fumes or odor could be drawn into
theroomthroughthereplace.
• Locate outside air inlet hood to prevent blockage from
leaves, snow/ice, or other debris. Blockages could cause
combustion air starvation and unit to overheat.
Figure 3.9 Outside Air Inlet Locations
Outside air is
required to be
installed on both
sides (right side not
shown)
Refer to Figures 3.8 and 3.9 when placing the outside air
inlet hoods.
• Cut a 6-1/2 in. (165 mm) hole in outside wall to
accommodate air piping.
• Use 6 in. (152 mm) ex (not supplied) to directly connect
outside air to replace intake. Insulate the pipe to prevent
frost condensation.
• Use the supplied outside air inlet hoods.
• Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
• Seal between the outside air inlet hoods and the house
with silicone to prevent air inltration.
NOTICE: The fireplace provides some outside air for
combustion. Other methods may be necessary if more air
is required.
WARNING! Risk of Fire! The outside air kits are installed
onthebothsidesofthereplacetopreventoverheating
andre..
Figure 3.8 Outside Air Installation
Outlet placed
higher than 3 ft
below the
termination cap
Attic space
Garage or
combustible
liquids storage
Outlet blocked by
snow, leaves, etc.
Clear area
outside
house or in
ventilated
crawl space
YES
NO
NO
NO
NO
Factory-built
fireplace
• Use UL181 Class 1 or Class 0 rigid or flexible ducting.
• Install with short run and add a P-trap which will help
prevent flow of cold air.
• Secure flex duct with screws or wire ties.
Typical Outside Air
Installation
Typical CAK Installation
Seal
Seal
24” (610 mm) min.
48” (1220 mm) max.
Note: The pipe
cannot lay on top
of the unit.
4” Duct-Use UL181
Class 0 or Class 1
ducting
Recommend
around 24 inches
for a minimum bend
Figure 3.10 P-Trap

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2316
20 ft (6.10 m) max.
pipe between an
offset & return
Ceiling firestop
35 ft (10.7 m)
max. straight
unsupported
chimney height
18.5 ft (5.64 m)
min. height
single offset-return
90 ft (27.4 m)
max. height
6 ft (1.83 m) max.
unsupported chimney
above roof
74 1/8 in.
(1884 mm)
Effective
Height
Figure 4.1 Chimney Requirements
NOTICE: Amaximumoftwopairsofosetsandreturns
may be used.
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.
44 Chimney and Termination Requirements
Table 4.2 Chimney Component Dimensions
Table 4.1 Chimney Requirements
•Minimum overall straight height 18 ft (5.5 m)
•Minimum height with o󰀨set/return 18.5 ft (5.64 m)
•Maximum height 90 ft (27.43 m)
•Maximum chimney length between an o󰀨set
and return
20 ft (6.1 m)
•Maximum distance between chimney
stabilizers
35 ft (10.67 m)
•Maximum unsupported chimney length
between the o󰀨set 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)
•Minimum height with double o󰀨set/return 22.5 ft (6.86 m)
HEIGHT OF CHIMNEY COMPONENTS in. mm
Chimney Stabilizer
SL11 4-3/4 121
O󰀨sets/Returns
SL1130 18 457
Chimney Sections*
SL1106 4-3/4 121
SL1112 10-3/4 273
SL1118 16-3/4 425
SL1136 34-3/4 883
SL1148 46-3/4 1187
* Dimensions reect e󰀨ective height.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 17
Table 4.3 O󰀨set Dimensions
B. O󰀨sets/Returns
• Use an o󰀨set/return to bypass overhead obstructions.
• An o󰀨set and return can be used as a single entity or separated by chimney section(s).
WARNING! Risk of Fire! DO NOT useoset/returnsgreaterthan30°.Chimneydraftwillberestrictedandcouldcause
overheatingandre.Secureosets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 o󰀨set/return.
• Read across the chart to nd the number of chimney sections/model numbers needed between the o󰀨set and return.
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 4.2 Chimney O󰀨set/Return
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 15-3/4 in. (400 mm) us-
ing a 30° o󰀨set/return.
You determine from the table that you need 36-5/8 in.
(930 mm) (Dimension “B”) between the o󰀨set and return.
The chimney components that best ts your application
are two SL1112’s.
A B
SL1106 SL1112 SL1118 SL1136 SL1148in. mm in. mm
4 7/8 124 17 7/8 454 -----
7 1/4 184 22 559 1 - - - -
9 3/4 248 26 1/8 664 2 - - - -
10 1/4 260 27 1/4 692 - 1 - - -
12 3/4 324 31 3/8 797 1 1 - - -
13 1/4 337 32 3/8 822 - - 1 - -
15 3/4 400 36 5/8 930 - 2 - - -
18 1/8 460 40 3/4 1035 1 2 - - -
18 3/4 476 41 3/4 1060 - 1 1 - -
21 3/4 552 47 1194 - - 2 - -
22 1/4 565 48 1219 - - - 1 -
24 3/4 629 52 1/8 1324 1 - - 1 -
27 3/4 705 57 3/8 1457 -1-1-
28 1/4 718 58 3/8 1483 ----1
30 3/4 781 62 1/2 1588 1 - - - 1
33 3/4 857 67 3/4 1721 - 1 - - 1
36 3/4 933 73 1854 - - 1 - 1
39 3/4 1010 78 1/8 1984 - - - 2 -
41 1/8 1045 82 3/8 2092 1 - - 2 -
45 3/4 1162 88 1/2 2248 - - - 1 1
48 1/8 1222 92 3/4 2356 1 - - 1 1
51 3/4 1314 98 7/8 2511 ----2
Proper assembly of air cooled chimney parts results in an overlap of chimney joints
of 1-1/4 in. (32 mm). E󰀨ective length is built into this table.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2318
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
Multiple Chimney Locations
A B
6 in. (minimum) up to 20 in.
152 mm/508 mm
18 in. minimum
457 mm
20 in. and over 0 in. minimum
Gas, Wood or Fuel Oil
Termination Cap
Wood
Minimum
(See
illustration
above)
B
Gas
Termination
Cap **
A *
Perpendicular Wall
*
If using decorative cap cover(s), this distance may need to be
increased. Refer to the installation instructions supplied with the
decorative cap cover.
**
In a staggered installation with both gas and wood terminations, the
wood termination cap must be higher than the gas termination cap.
Figure 4.3 Multiple Chimney Locations
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).
• The distance required between caps is shown below.

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23 19
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 screws
(outer pipe only)
Attic shield
The chimney must be
enclosed from the
replace to the attic
maintaining the 2
inch clearances.
55 Chimney Installation
Figure 5.1 Typical Chimney System - Guidelines for Chimney System Installation
NOTICE: Chimney performance may vary.
• Trees,buildings,rooflinesandwindconditionsaectperformance.
• Chimney height may need adjustment if smoking or overdraft occurs.
A. Typical Chimney System

Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/2320
NOTICE: Chimney sections cannot be disassembled once
locked together. Plan ahead!
• Lock chimney sections and/or o󰀨sets/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
fastenoset/returnstochimneysectionstokeepthe
chimney parts from twisting. Failure to do so could
causere.
• Fasten o󰀨set/returns to chimney sections. 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
Use only those components described in this manual.
Substitute or damaged chimney components could impair
safe operation and cause overheating and re.
Attach either a straight chimney section or an o󰀨set to
the top of the replace (depending on your installation
requirement). Chimney sections are locked together by
pushing downward until the top section meets the stop
bead on the lower section.
The inner ue is placed to the inside of the ue section
below it. The outer casing is placed outside the outer cas-
ing of the chimney section below it. See Figure 5.2.
WARNING! Risk of Fire! DO NOT install substitute or
damaged chimney components.
Figure 5.2 Assembling Chimney Sections
C. Install Chimney Air Kit (optional)
• Follow instructions included with accessory.
Chimney
Air Kit
Figure 5.3 CAK on Top of Unit