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20
B
A
12 in.
[305 mm]
9 3/4 in.
[248 mm]
12 in.
[305 mm]
10 3/4 in.
[273 mm]
FLUSH
FRONT
4 in.
[102 mm]
BRICK
FRONT
50° angle
39° angle
Grid represents 1 in. scale
D. Frame the Fireplace
Figure 6.4 shows typical framing using combustible materials (2x4 lumber shown).
• Observe all required air space clearances to combustible materials as shown in Figure 6.2.
• Framing across the top of fi replace must be above top standoffs.
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.
Figure 6.4 Framing the Fireplace
C. Sidewalls/Surrounds
• Adjacent combustible sidewalls must be located a minimum of 12 in. (305 mm) (may be 24 in) from the fi replace
opening.
• Combustible and noncombustible mantel legs, surrounds and stub walls may be constructed per Figure 6.3.
Figure 6.3 Mantel Leg or Wall Projections (Acceptable on both sides of opening)
Model # A B* C** D
A36
in. 43 23 41 1/2 8
mm 1092 584 1054 203
A42
in. 49 23 41 1/2 8
mm 1245 584 1054 203
* If interior of chase will be drywalled, add the thickness to this measurement.
** Adjust header height for a raised fl oor under fi replace.
Model #
A
Fireplace Opening
B
Outside Dimensions
A36
in. 36 42
mm 914 1067
A42
in. 42 48
mm 1067 1219
Heatilator • A36C & A42C • 28396 • Rev AG • 11/08
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