Heatilator BIR42-B User manual

1Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
Installation and service of this fi replace should be
performed by qualifi ed personnel. Hearth & Home
Technologies recommends NFI certifi ed profes-
sionals, or technicians supervised by an
NFI certifi ed professional.
WOODBURNING FIREPLACE
Fire Risk.
WARNING
For use with solid wood fuel only.
Other fuels may overfire 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
fi replace.
• Alert children and adults to hazards of high temperatures.
High temperatures may ignite clothing or other flammable
materials.
• Keep clothing, furniture, draperies and other fl ammable
materials away.
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
BIR42-B
NOTICE: DO NOT discard this manual!
•DO NOT store or use gasoline or other fl am-
mable vapors and liquids in the vicinity of this
or any other appliance.
• DO NOT overfi re. Overfi ring will void your
warranty.
• Comply with all minimum clearances to com-
bustibles as specifi ed. Failure to comply may
cause house fi re.
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury, or death.

2 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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 fi replace or to property.
Table of Contents
1 Product Specific & Important Safety Information
A. Fireplace Certifi 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. Fireplace Dimensions 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 13
G. Outside Air Kit 14
4 Chimney and Termination Requirements
A. Chimney Requirements 15
B. Offsets/Returns 16
C. Termination Requirements 17
5 Chimney Installation
A. Typical Chimney System 18
B. Assemble Chimney Sections 19
C. Secure Offset/Return 20
D. Install Ceiling Firestops 20
E. Install Attic Insulation Shield 21
F. Roof Penetration 22
G. Install Chase/Chase Top 22
H. Termination Cap Requirements 23
I. Install Termination Cap 23
6 Shrouds
A. Radiation Shield 25
B. Field Constructed Shrouds 25
7 Finishing
A. Finishing Material 27
B. Hearth Extension, Building and Finishing 29
1. Fireplace Installed Flush on the Floor
and Hearth Extension Raised to Bottom
of Firebox Opening 30
2. Raised Hearth Extension and Raised Fireplace 31
3. Fireplace Opening and Hearth Extension Flush
with the Floor 32
C. Non-Combustible Sealant Material 32
D. Sidewalls/Surrounds 33
E. Mantel and Wall Projections 33
8 Fireplace Setup
A. Install Hearth Molded Brick Panel 34
B. Install Back Molded Brick Panel/Traditional 34
C. Install Side Molded Brick Panel/Traditional 34
D. Install Back Molded Brick Panel - Herringbone 35
E. Install Side Molded Brick Panel - Herringbone 35
F. Install Screens 36
G. Install Mortar (Optional) 36
H. Grate 36
I. Gas Log/Lighter Provision 37
J. Wood Burning Inserts 37
9 Reference Materials
A. Chimney Components 38
B. Optional Components 42
Note: An arrow found in the text signifi es change in content.
►

3Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
Customer:
Lot/Address
Model (circle one): BIR42-B
YES IF NO, WHY?
Firestops installed.
Attic insulation shields are installed.
Dealer/Distributor Phone #
Serial #:
Chimney Sections 4 & 5 (Pg. 15)
Fireplace Install
Chimney air kit 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:
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. 29)
Outside air kit installed. (Pg. 14)
Chimney configuration complies with diagrams.
Chimney installed, locked and secured in place with proper clearance.
Terminations installed.
Roof flashing installed.
Shrouds Section 6 (Pg. 25)
Shrouds properly installed per instructions
4059-717 • Rev B • 2-7-13
Grate is properly installed.
(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.
________________________________________________________________________________________________________
________________________________________________________________________________________________________
Finishing Section 7 (Pg. 27)
Protective hearth strips and hearth extension installed per manual requirements.
Comments communicated to party responsible
• Photographing the installation and copying this checklist for your file.
• That this checklist remain visible at all times on the fireplace until the installation is complete.
Combustible materials not installed in non-combustible areas.
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.
Fireplace Setup Section 8 (Pg. 34)
Hearth & Home Technologies recommends the following:
__________________________ by ______________________on ________
Molded brick panels isntalled correctly.

4 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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 fireplace
• modify fireplace
• install other than as instructed by Hearth & Home
Technologies
• operate the fireplace without fully assembling all
components
• overfire
• install any unvented gas log sets
• 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 qualified
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 fi bers - Plastic
- Plywood/OSB - Sheet rock (drywall)
• Any material that can ignite and burn; fl ame proofed or
not, plastered or un-plastered
1 Product Specific & Important Safety Information
A. Fireplace Certification
This fi replace may be installed in sleeping rooms EX-
CEPT in manufactured homes. If installed with a gas log
set, provisions for the National Fuel Gas Code must be
met.
This fi replace has been tested and listed for use with the
optional components specifi 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 signifi cant reconstruction and is best if installed at
the time of fi replace installation.
Heatilator is a registered trademark of Hearth & Home
Technologies.
This fi replace system has been tested and listed in accor-
dance with UL 127 standards by Underwriters Laborato-
ries Inc. for installation and operation in the United States.

5Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
2 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)
Transition

6 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
Figure 2.2 Fireplace Locations
NOTICE:
• Illustrations and photos reflect 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 fireplace 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, fire
offi cials or authorities having jurisdiction over restrictions,
installation inspection and permits.
1. Selecting Fireplace Locations
This fi 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 fi replace in a basement, 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 fi replace-
comes equipped with outside air inlets to feed combustion
air from outside the home, along with outside air termina-
tion caps; the rigid metal duct is required but not supplied.
Consideration should be given to these factors before
deciding on a location.
A
F
D
BC
5/8 in. (16 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
84 in.
(2134 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. 77 7/8 53 7/8 95 1/4 47 5/8 22 1/2 67 3/8 28 3/8
mm 1978 1368 2419 1210 572 1711 721
BIR42

7Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
2. Locating Fireplace & Chimney
Location of the fi replace and chimney will affect 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 fi re.
• Penetrate the highest part of the roof. This minimizes
the effects of wind loading.
• Locate termination cap away from trees, adjacent
structures, uneven roof lines and other obstructions.
• Minimize the use of chimney offsets.
• Consider the fi replace location relative to fl oor and ceiling
and attic joists.
• Take into consideration the termination requirements in
Section 5.
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Location NOT
Recommended
Multi-level Roofs
Windward
Leeward
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 fi replace.
• Avoid installing the fi 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.

8 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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 fi re-
place dry.
• Remove fi 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 benefit.
E. Fireplace System Requirements
The Heatilator fi replace system requirements consist of
the following:
• Fireplace
- Molded brick panels (hearth panal Included with
fi replace, side and back panels sold separately)
- Firescreen (included with fi replace)
- Hearth Extension (sold separately)
- Grate (included with fi replace)
• Outside Air System
- Air Inlet Hood (included with fi replace)
- Flex (required, sold separately)
• Chimney System
- Attic insulation shield (included with fi replace)
- Chimney termination cap (sold separately)
• Non-combustible fi nish material

9Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
74 ° TYP.
11 in.
(281 mm)
27 1/2 in.
(699 mm)
5 in.
(129 mm)
16 1/8 in.
(408 mm)
11 1/8 in.
(282 mm)
6 7/8 in.
(175 mm)
52 7/8 in.
(1343 mm)
42 in.
(1067 mm)
54 in.
(1372 mm)
38 in.
(965 mm)
74 1/8 in.
(1884 mm)
3 3/4 in.
(95 mm)
5 in.
(129 mm)
6 7/8 in.
(175 mm)
11 18 in.
(282 mm)
16 1/8 in.
(408 mm)
5 1/2 in.
(25 mm)
67 3/8 in.
(1711 mm)
61 7/8 in.
(1572 mm)
37 1/8 in.
(943 mm)
70 3/4 in.
(1797 mm)
14 in.
(356 mm) diameter
18 1/2 in.
(470 mm)
3 Framing and Clearances
A. Fireplace Dimensions
Figure 3.1 Fireplace Dimensions

10 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
(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
Transition
B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
to combustibles as specifi ed in Figure 3.2. DO NOT pack
required air spaces with insulation or other materials.
Framing or finishing material used on the front of, or in
front of, the fireplace closer than the minimums listed must
be constucted entirely of non-combustible materials (i.e.,
steel studs, concrete board, etc.). Failure to comply may
cause fire.
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 standoffs to header 0 in. (0 mm)
Door opening to sidewall 24 in. (610 mm)
MANTEL
Mantel minimum height 63-3/4 in. (1619 mm)
Maximum mantel depth 12 in. (305 mm)

11Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
C. Construct the Chase
A chase is a vertical boxlike structure built to enclose the
fi 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 fi restops/
attic shields at each fl oor of the chase or every 10 ft (3048
mm) of clear space to control spread of fi re.
Walls, ceiling, base plate and cantilever fl oor at the fi rst
level of the chase should be insulated (see Figure 3.3.)
Vapor and air infi 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 stuffed with unfaced fi 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 offset 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 fi restop spacer and attic insulation
shield should be installed in an insulated false ceiling
at the 8 ft. (2438 mm) level above the fi 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 fi replace.
WARNING! You must install false ceilings and ceil-
ing firestops at each floor of the chase or every 10 ft
(3.05 m) to control spread of fire.
WARNING! Risk of Fire! DO NOT seal area between fire
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 firmly 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 fireplace or chimney.
• Failure to prevent contact between insulation or other
materials and chimney system may cause overheating
and fire.
Three examples of chase applications are shown in Fig-
ure 3.4.

12 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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.
D
A B * C ** D
in.
mm 305
28 3/8 74 1/2
18927211368
12
Model #
* If interior of chase will be drywalled, add the thickness to this meaurement.
** Adjust header height for raised floor under fireplace.
Bir 42-B
The fireplace header cannot be positioned until
after the fireplace assembly is in place.
Framing must be extended straight up, all
the way to the ceiling.
53 7/8
D. Frame the Fireplace
NOTICE: Hearth extension design must be determined
before installation of fi replace.
If the fi replace is placed on the fl oor, the maximum height
of a fi nished raised hearth is 3-3/4”, if you want a higher
raised hearth the fi replace must be placed on a platform.
The BIR42-B Fireplace will fi t a framed opening height of
74-1/2 in. (1892 mm) tall and 53-7/8 in. (1368 mm) wide.
Figure 3.5 shows a typical framing (using 2 x 4 lumber) of
the fi replace, assuming combustible materials are used.
All required clearances to combustibles around the fi re-
place must be adhered to. See Figure 3.2. Any framing
across the top of the fi replace must be above the level of
the top standoffs. (No recess above standoffs.)
The fi nished cavity depth must be no less than 28-3/8 in.
(721 mm) from the fi 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 specified.
• A minimum 1-1/2 in. (38 mm) air clearance must be
maintained at the back and 1-1/2 in. (38 mm) to the
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

13Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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)
T
op p
i
ece must over
l
ap
bottom piece
Nail or screw metal strips in place.
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 fi replace.
• Slide each metal strip 2 in. (51 mm) under front edge of
fi replace.
• Overlap strips in the middle of fi replace opening by 1 in.
(25 mm) minimum.
• Metal strips must extend beyond the front and sides
of the fi 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 fi replace)
per Figure 3.7. 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 flooring.
WARNING! Risk of fire! High temperatures, sparks,
embers or other burning material falling from the
fireplace may ignite flooring or concealed combustible
surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specified.
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 fireplace assembly.
E. Secure and Level the Fireplace
This fi replace may be placed on either a combustible or
noncombustible continuous fl at surface. Slide the fi 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
fi replace.
The fi replace should be positioned so the face of the non-
combustible material on the fi replace will be fl ush with the
face of the drywall on the walls.
Level the fi replace and shim as necessary.

14 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
3 ft min. from
top of uppermost
chimney section
to air inlet.
G. Outside Air Kit
Outside air kits must be used for combustion. Hearth &
Home Technologies recommends you utilize the shortest
duct run to optimize the performance of the outside air kit.
The outside air kit inlets 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 verti-
cally. In such an installation, a 3 ft (914 mm) height differ-
ence must be maintained from the top of the uppermost
chimney section to the outside combustion air inlets.
Refer to Figures 3.8 and 3.9 when placing the outside air
inlets.
The outside air kits are installed on the each side of the
fi replace.
• Cut a 6 in. (152 mm) hole in outside wall to accommodate
air piping.
• Use 6 in. (152 mm) metal fl ex or rigid piping (not supplied)
to directly connect outside air to fi replace intake. Insulate
the pipe to prevent frost condensation.
• Use the supplied termination cap.
• Seal between the wall and the pipe with silicone to
prevent moisture penetration and air leaks.
• Seal between the termination cap and the house with
silicone to prevent air infi ltration.
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, floor 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 fireplace.
• Locate outside air inlet to prevent blockage from leaves,
snow/ice, or other debris. Blockages could cause
combustion air starvation.
Figure 3.8 Outside Air Inlet Locations
Figure 3.9 Outside Air Installation
Outside air installed
on both sides (right
side not shown)
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
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dip for cold air trap which will help prevent flow of cold air.
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►

15Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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
97 1/2 in.
(2477 mm)
Effective
Height
14-11
Transition
Attic Insulation
Shield
Figure 4.1 Chimney Requirements
NOTICE: A maximum of two pairs of offsets 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 fire.
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 fireplace or at
any chimney joint.
A. Chimney Requirements
Vertical distances are measured from the base of the
fi replace as shown in Figure 4.1.
4 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 offset/return 18.5 ft (5.64 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 fi replace
35 ft (10.67 m)
• Maximum unsupported chimney above roof 6 ft (1.83 m)
HEIGHT OF CHIMNEY COMPONENTS in. mm
Chimney Stabilizer
SL11 4-3/4 121
Ceiling Firestops
FS538 0 0
FS540 0 0
Offsets/Returns
SL1130 18 457
Roof Flashing
RF570 0 0
RF571 0 0
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 reflect effective height.

16 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
Table 4.3 Offset Dimensions
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 fi 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 fi 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
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)
using a 30° offset/return.
You determine from the table that you need 36-5/8 in.
(930 mm) (Dimension “B”) between the offset and return.
The chimney components that best fi ts your application
are two SL1112’s.
AB
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 4 8 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). Effective length is built into this table.

17Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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
AB
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 fi 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.

18 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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
5 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 affect performance.
• Chimney height may need adjustment if smoking or overdraft occurs.
A. Typical Chimney System

19Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
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 fl ue.
WARNING! Risk of Fire! You MUST use screws (pro-
vided) to fasten offset/returns to chimney sections to
keep the chimney parts from twisting. Failure to do so
could cause fire.
• Fasten offset/returns to chimney sections. Insert the
screws (provided) through the predrilled holes. Do NOT
penetrate inner fl 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 fi re.
Attach either a straight chimney section or an offset to
the top of the fi 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 fl ue is placed to the inside of the fl 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

20 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
C. Secure Offset/Return
D. Install Ceiling Firestops
CAUTION! Risk of Fire! Ceiling firestops must be used
whenever the chimney penetrates a ceiling/floor.
• Chase construction requires ceiling firestops at each
fl oor or every 10 ft. (3.05 m) of clear space.
• The ceiling firestop slows spread of fire and reduces
cold air infiltration.
• Install a ceiling fi restop whenever chimney penetrates
ceiling/fl oor.
• Mark and cut an opening in ceiling as shown in Figure 5.4.
• Frame the opening with the same size lumber used in
the ceiling joists.
• Nail the ceiling fi 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 fi restop may then be attached above or below
the joists.
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
fi 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 5.4 Installing the Ceiling Firestop
When offsets and returns are joined to straight pipe sec-
tions, they must be locked into position with the screws
provided* (outer only), using the predrilled holes. To pre-
vent gravity from pulling the chimney sections apart, the
returns and the chimney stabilizers have hanger straps for
securing these parts to joists or rafters. See Figure 5.3.
* Use # 6 or # 8 sheet metal screw, or larger, no longer
than 1/2 in. (13 mm).
WARNING! Risk of Fire!
• Secure offsets with screws (not to exceed 1/2 in./13 mm
In length).
• Secure returns with strapping.
• Straight chimney sections may be secured with screws
(not to exceed 1/2 in./13 mm In length) at the joints.
• Keep chimney sections from separating or twisting.
Ceiling
Firestop
Straps
Optional
Additional
Support
Joint
Band
(Optional)
Figure 5.3 Secure the Chimney
Catalog #
AB
in. mm in. mm
FS538 17 432 17 432
FS540 17 432 26 660