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WARNING! Risk of Fire!
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In length).
• Secure returns with strapping.
• Straight chimney sections may be secured with screws
(not to exceed 1/2 in./13 mm In length) at the joints.
• Keep chimney sections from separating or twisting.
Straps
Optional
Additional
Support
Figure 5.4 Secure the Chimney
E. Install Ceiling Firestops
CAUTION! Risk of Fire!
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the joists.
 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev AD • 06/23
Ceiling
Firestop
Joint
Band
(Optional)
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ROOM ABOVE (non-insulated ceiling)
B
Ceiling firestop
attached to bottom
of framing
ATTIC ABOVE (insulated ceiling)
Ceiling firestop
attached to top of
framing
2 in. (51mm)
clearance
Note:
Use same dimensional lumber for framing
ceiling firestop and joists.
A
Catalog # in.
)6 
)6 
Figure 5.5 Installing the Ceiling Firestop
WARNING! Risk of Fire! DO NOT seal area between
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ter the attic or leave the warm air envelope of the home
(use 600° F sealant).
A
2 in. (51mm)
clearance
B
mm in. mm