Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
13
B. Clearances Within Enclosed Area
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
to combustibles as specified in Figure 3.2.
WARNING! DO
NOT
PACK REQUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIALS. Framing or finishing material
used on the front of, or in front of, the fireplace closer than
the minimums listed must be constructed entirely of non-
combustible materials (i.e., steel studs, concrete board,
etc.). Failure to comply may cause a fire.
Figure 3.2 Clearances to Combustible Materials
Minimum Clearances to Combustibles
WITHIN ENCLOSURE AREA
Standoffs to backwall
0 in. (0 mm)
Standoffs to sidewall
0 in. (0 mm)
Top standoffs to header
0 in. (0 mm)
Door opening to sidewall
12 in. (305 mm)
(insulation)
0 in. to level
of standoffs
Attic
Insulation
Shield
(ceiling)
(roof)
(attic)
(ceiling)
Ceiling Firestop
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
Must have 2 in. (51 mm)
minimum clearance
to header
0 in.
to floor
2 in. (51 mm) min.
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Combustible Object
48 in.
1219 mm
