Minimum Clearances - Heatilator C40 Installation Manual

1. Minimum Clearances

WITHIN ENCLOSURE AREA
Fireplace to backwall
Fireplace to sidewall
Duct boots to framing
Top standoffs to header
Door opening to sidewall
EXPOSED SURFACES
Faceplate to sidewall
Heat zone air grills to ceiling 12 in. (305 mm)
MANTEL
Non-combustible mantel
(Non-combustible framing
materials above the fireplace
to ceiling)
Combustible mantel
(Combustible framing
materials above the fireplace
to ceiling)
Maximum mantel depth
►
2 in.
(51 mm)
43-7/8 in.
(1114 mm)
24 in.
(610 mm)
The finished cavity depth must
be no less than 24 in. (610 mm)
from the finished backwall to
the outside of front wall framing.
Figure 3.3 Framing the Fireplace
12
1 in. (25 mm)
1 in. (25 mm)
0 in. (0 mm)
0 in. (0 mm)
22-7.8 in. (581 mm)
16 in. (406 mm)
46 in. (1168 mm)
60 in. (1524 mm)
12 in. (305 mm)
NOTE: 2 x 4s must be used
for the header in order to
maintain clearances to the
pipe.
12 in.
(305 mm)
Position combustible/
non-combustible mantel:
see table above.
42-1/4 in.
(1073 mm)
48-1/4 in.
(1226 mm)
Heatilator • C40 Constitution • 480-2340 Installation Manual • Rev K • 8/24/15