Frame The Fireplace - Heatilator BIR42-B Installation Manual

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.
(724 mm) from the finished backwall to the outside of front
wall framing. Framing must extend straight up all the way
to the ceiling.
2 in. (51 mm)
min. air space
clearance
from chimney.
C
B
►
Figure 3.5 Framing the Fireplace
12 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev P • 09/28/15
D
A
D
Model #
BIR42-B
* If interior of chase will be drywalled, add the thickness to this measurement.
** Adjust header height for raised floor under fireplace.
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.
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.
CAUTION! Risk of Cuts/Abrasions. Wear protective gloves
and safety glasses during installation. Sheet metal edges
are sharp.
Fireplace must be set out
1/2 in. (13 mm) in front of
1/2 in.
the face of the framing
(13 mm)
material.
Framing must be extended straight up 84 in.
(2134 mm) from the base of the fireplace.
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.
A B *
in.
53 7/8
28 1/2
mm
1368 724
C ** D
74 1/2
12
305
1892