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28
3 in. (76 mm)
overlap
Insert three
screws
Bend inward
90°
Bend remaining tabs
to rest against pipe to
prevent insulation
from falling in.
Figure 8.6 Prepare Attic Insulation Shield
Installation of a ceiling fi restop is required
• Refer to Figures 8.6 - 8.8.
• Roll the shield (around the chimney if already installed)
until you have a 3 in. (76 mm) overlap and the three
holes on each side match up (large holes on top).
• Insert three screws into the matching holes to form a
tube.
• Bend three tabs on the bottom of the tube inward to 90°
to maintain chimney air space as shown in Figure 8.6.
• Rest the insulation shield on the ceiling fi restop below.
• Bend the three short tabs at the top of the shield inward
to 90° to maintain the 2 in. (51 mm) air space from the
chimney.
• Bend the remaining top tabs to just meet the pipe.
F. Installing Attic Insulation Shield
WARNING! Risk of Fire! You MUST install an attic insu-
lation shield when there is any possibility of insulation or
other combustible material coming into contact with the
chimney.
• DO NOT pack insulation between the chimney and the
attic insulation shield.
• Failure to keep insulation and other materials away from
chimney pipe could cause fi re.
• DO NOT offset chimney inside insulation shield.
If you wish to make a custom shield or barrier, follow
these guidelines:
• Metal is preferred, although any material stiff enough to
hold back the insulation can be used.
WARNING! Risk of Fire! Use of cardboard or other
materials that can defl ect under humidity or other envi-
ronmental conditions is not recommended.
• The shield or barrier must be tall enough to extend
above the insulation and prevent blown-in insulation
from spilling into the cavity.
• Maintain specifi ed air spaces around chimney.
• Check instructions and local codes for further details.
Heatilator • A36C & A42C • 28396 • Rev AG • 11/08
6 Tabs bent
in 90°
Tabs bent in to
rest against pipe
Attic Insulation Shield
Ceiling Firestop
10-1/2 in.
(267 mm)
14-1/2 in. (368 mm)
diameter
Insulation
Insulation
Pipe
Pipe
Figure 8.7 Install Attic Insulation Shield (fi restop above ceiling)
6 Tabs bent
in 90°
Tabs bent in to
rest against pipe
Attic Insulation Shield
Ceiling Firestop
10-1/2 in.
(267 mm)
14-1/2 in. (368 mm)
diameter
InsulationInsulation
Pipe
Pipe
Figure 8.8 Install Attic Insulation Shield (fi restop below ceiling)