Clearances; Minimum Clearances To Combustibles - Heatilator BIR42-B Installation Manual

B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
to combustibles as specified in Figure 3.2. 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 fire.
Figure 3.2 Clearances to Combustible Materials
10
Storm Collar
Roof Flashing
(attic)
(insulation)
2 in. (51 mm) min.
Ceiling Firestop
48 in.
1219 mm
0 in.
to floor
Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23

Minimum Clearances to Combustibles

WITHIN ENCLOSURE AREA
Fireplace to backwall
Fireplace to sidewall
Top standoffs to header
Door opening to sidewall
MANTEL
Mantel minimum height
Maximum mantel depth
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
Attic
Insulation
Shield
(ceiling)
Offset/Return (secured
with hanger straps)
(ceiling)
Must have 2 in. (51 mm)
minimum clearance
to header
1-1/2 in. (38 mm) to back &
sides of appliance
(except at nailing flanges
where it is 1/2 in. [13 mm])
1-1/2 in. (38 mm)
1-1/2 in. (38 mm)
0 in. (0 mm)
24 in. (610 mm)
22 in. (559 mm)
above opening
12 in. (305 mm)