Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev H • 10/09/13
12
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.
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
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.
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 fireplace.
If the fireplace is placed on the floor, the maximum height
of a finished raised hearth is 3-3/4”, if you want a higher
raised hearth the fireplace must be placed on a platform.
Figure 3.5 shows a typical framing (using 2 x 4 lumber) of
the fireplace, assuming combustible materials are used.
All required clearances to combustibles around the fire-
place must be adhered to. See Figure 3.2. Any framing
across the top of the fireplace must be above the level of
the top standoffs. (No recess above standoffs.)
The finished cavity depth must be no less than 28-1/2 in.
(673 mm) from the finished 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 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
