Sidewalls/Surrounds; Frame The Fireplace - Heatilator A36R Owner's Manual

C. Sidewalls/Surrounds
• Adjacent combustible sidewalls must be located a minimum of 12 in. (305 mm) (may be 24 in) from the fireplace
opening.
• Combustible and non-combustible mantel legs, surrounds and stub walls may be constructed per Figure 6.3.
FLUSH
FRONT
10 3/4 in.
[273 mm]
12 in.
[305 mm]
Figure 6.3 Mantel Leg or Wall Projections (Acceptable on both sides of opening)
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 fireplace must be above top standoffs.
2 in. (51 mm)
min. air space
clearance
from chimney.
C
B
Figure 6.4 Framing the Fireplace
20
Grid represents 1 in. scale
A
B
A
Heatilator • A36R & A42R • 28376 • Rev AJ • 08/09
4 in.
[102 mm]
BRICK
FRONT
9 3/4 in.
[248 mm]
12 in.
[305 mm]
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
Model #
in.
A36
mm
in.
A42
mm
* If interior of chase will be drywalled, add the thickness to
this measurement.
** Adjust header height for a raised floor under fireplace.
A
Fireplace
Opening
Model #
in. 36
A36
mm 914
in. 42
A42
mm 1067
A B* C**
43 23 41 1/2
1092 584 1054
49 23 41 1/2
1245 584 1054
B
Outside
Dimensions
42
1067
48
1219
D
8
203
8
203