Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
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Installation of a firestop is required:
• Refer to Figures 5.6, 5.7.
• Roll the shield (around the chimney if already installed).
The three holes on each side will match up (large holes
on top).
• Insert three screws into the matching holes to form a
tube.
• Bend the tabs at the bottom and top of the tube inward
to 90° to maintain chimney air space.
• Rest the insulation shield on the ceiling firestop below.
• Bend the remaining tabs at the top of the shield inward
to rest against pipe to prevent insulation from falling in.
When making a custom shield or barrier, follow these
guidelines and code requirements:
• Metal is preferred, although any material stiff enough to
hold back the insulation can be used.
• Use of cardboard or other materials that can deflect
under humidity or other envirornmental conditions is
not allowed. The shield or barrier must be tall enough
to extend above the insulation and prevent blown-in
insulation from spilling into the cavity.
• Maintain specified air spaces around chimney.
E. Install Attic Insulation Shield Provided
WARNING! Risk of Fire!
You MUST install the attic insula-
tion shield in attic or chase installation.
•
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 fire.
•
DO NOT
offset chimney inside insulation shield.
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 5.6 Prepare Attic Insulation Shield
Figure 5.7 Install Attic Insulation Shield (firestop 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
Insulation
Insulation
Pipe
Pipe
2 in. (51 mm)
air space