Install Attic Insulation Shield - Heatilator BIR42-B Installation Manual

F. Install Attic Insulation Shield
WARNING! Risk of Fire!
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 fire.
• DO NOT offset chimney inside insulation shield.
• Combustible material may come into contact with the attic
insulation shield as long as the required clearances are
maintained to the chimney pipe.
Installation of a ceiling firestop is required:
• Refer to Figures 5.5, 5.6, 5.7.
• If the attic shield is pre-rolled continue. If it is a flat part,
try and roll it up to aid in wrapping it around the chimney.
• Pre-bend all the tabs in at the top to 45°.
• Wrap the shield (around the chimney if already installed)
until you have an 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 starting at the bottom.
• Bend the tabs on the bottom of the tube inward to 90° to
maintain chimney air space.
• Rest the insulation shield on the ceiling firestop below.
• Tape off any opening around the bottom.
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!
materials that can deflect 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 specified air spaces around chimney.
• Check instructions and local codes for further details.
Double-check the Chimney Assembly
Continue assembling the chimney sections up through
the ceiling firestops as needed. While doing so, be
aware of the height and unsupported chimney length
limitations given under Section 5.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the suc-
ceeding sections. If they have been connected correct-
ly, they will not disengage when tested.
22
You MUST install an attic insu-
Use of cardboard or other
Heatilator • Birmingham 36-B Installation Manual • 4059-709 • Rev AB • 06/23
Figure 5.6 Prepare Attic Insulation Shield
2 in. (51 mm)
air space
5 Tabs bent
Insulation
13 in.
(330 mm)
Figure 5.7 Install Attic Insulation Shield (firestop above ceiling)
2 in. (51 mm)
air space
5 Tabs bent
Insulation
13 in.
(330 mm)
Figure 5.8 Install Attic Insulation Shield (firestop below ceiling)
Pre-bend the tabs to
rest against pipe to
prevent insulation
from falling in.
Insert three
screws
(5)Tabs bent
in 90°
Tabs bent in to
rest against pipe
Pipe
Attic Insulation Shield
17 in. (432 mm)
diameter
in 90°
Ceiling Firestop
Pipe
Insulation
Seal with tape
Tabs bent in to
rest against pipe
Pipe
Attic Insulation Shield
17 in. (432 mm)
diameter
in 90°
Insulation
Ceiling Firestop
Pipe
Seal with tape