Hearth and Home Technologies BIR42-B - Manual (Page 19)

19
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.
Heatilator • Birmingham BIR42-B • 4059-681C• 9/12
(insulation)
Attic
Insulation
Shield
(ceiling)
(roof)
(attic)
(ceiling)
Ceiling Firestop
Offset/Return (secured
with hanger straps)
Storm Collar
Roof Flashing
1-1/2 in. (38 mm) to back &
sides of appliance
(except at nailing flanges
where it is 1/2 in. [13 mm])
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
Transition
Figure 6.2 Air Space Clearances