Heatilator Birmingham BIR42-B Installation Manual page 10

B. Clearances
WARNING! Risk of Fire!
You must comply with all minimum air space clearances
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required air spaces with insulation or other materials.
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be constructed entirely of non-combustible materials (i.e.,
steel studs, concrete board, etc.). Failure to comply may
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Figure 3.2 Clearances to Combustible Materials
 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
Storm Collar
Roof Flashing
(attic)
(insulation)
2 in. (51 mm) min.
Ceiling Firestop
48 in.
1219 mm
0 in.
to floor
Minimum Clearances to Combustibles
WITHIN ENCLOSURE AREA
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MANTEL
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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
Transition
1-1/2 in. (38 mm) to back &
sides of appliance
(except at nailing flanges
where it is 1/2 in. [13 mm])
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