Heatilator • BCBV36 • 4008-033 • Rev P • 8/12
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A. Pipe Clearances to Combustibles
Vent clearances are per vent manufacturer’s specifica-
tions. The vent MUST be Listed B-Vent pipe.
WARNING! Risk of Fire! MAINTAIN AIR
space clearance
to vent.
DO NOT
pack insulation or other combustibles:
• Between ceiling firestops
• Between wall shield firestops
• Around vent system
Failure to keep insulation or other material away from vent
pipe may cause over heating and fire.
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Vent Clearances and Framing
B. Wall and Ceiling Penetration Framing
For a wall or ceiling penetration consult B-vent pipe
manufacturer’s instructions to provide adequate clear-
ances. Use same size framing materials as those used in
the wall or ceiling construction. Firestop spacers must
be used in wall and ceiling penetrations per the B-Vent
pipe manufacturer’s specifications and national, regional
and local codes.
Note:
MUST terminate vertically.
C. Vertical Penetration Framing
WARNING! Fire Risk. DO NOT
allow loose materials or
insulation to touch vent. Hearth & Home Technologies Inc.
requires the use of an attic shield.
The National Fuel Gas Code ANSI Z223.1 and NFPA 54
requires an attic shield constructed of 26 gauge minimum
metal that extends at least 2 in. (51 mm) above insulation.
Attic shields must meet specified clearance and be se-
cured in place.
Use B-vent manufacturer’s firestops to provide adequate
clearances.
