Frame The Fireplace - Heatilator BIR50-B Installation Manual

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 BIR50-B Fireplace will fi t a framed opening height of
74-1/2 in. (1892 mm) tall and 61-7/8 in. (1572 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 28-1/2 in.
(673 mm) from the fi nished 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 BIR50-B Installation Manual • 4059-701 • Rev B • 2/6/13
E
Note: Framing must be
extended straight up,
all the way to the ceiling.
A
D
Model #
BIR-50
* If interior of chase will be drywalled, add the thickness to this meaurement.
** Adjust header height for raised floor under fireplace.
WARNING! Risk of Fire!
ances specifi ed.
• 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 fi replace 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!
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.
The header cannot be positioned until
after the fireplace assembly is in place.
Header MUST NOT be notched!
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 *
in.
61 7/8 28 1/2
mm 1572 724
Comply with all minimum clear-
You must comply with all
C ** D E min.
74 1/2 12
1892 305 533
21