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B. Clearances
WARNING! Risk of Fire! You must comply with all minimum air space clearances to combustibles as specified in Fig-
ure 6.2. DO NOT pack required air spaces with insulation or other materials.
Storm Collar
Roof Flashing
Shaded areas
represent
2 in. (51 mm) min.
air space clearance
required around pipe
(attic)
Attic
Insulation
Shield
(insulation)
(ceiling)
Offset/Return (secured
2 in. (51 mm) min.
with hanger straps)
(ceiling)
Ceiling Firestop
Must have 2 in. (51 mm)
minimum clearance
to header
Transition
48 in.
1219 mm
1-1/2 in. (38 mm) to back &
sides of appliance
0 in.
(except at nailing flanges
to floor
where it is 1/2 in. [13 mm])
Figure 6.2
Air Space Clearances
19
Heatilator • Birmingham BIR42 • 4059-308 Rev J • 1/11
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