Secure Offset/Return; Install Ceiling Firestops - Heatilator BIR42-B Installation Manual

C. Secure Offset/Return
When offsets and returns are joined to straight pipe sec-
tions, they must be locked into position with the screws
provided* (outer only), using the predrilled holes. To pre-
vent gravity from pulling the chimney sections apart, the
returns and the chimney stabilizers have hanger straps for
securing these parts to joists or rafters. See Figure 5.3.
* Use # 6 or # 8 sheet metal screw, or larger, no longer
than 1/2 in. (13 mm).
WARNING! Risk of Fire!
• Secure offsets with screws (not to exceed 1/2 in./13 mm
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 5.3 Secure the Chimney
D. Install Ceiling Firestops
CAUTION! Risk of Fire!
whenever the chimney penetrates a ceiling/fl oor.
• Chase construction requires ceiling fi restops at each
fl oor or every 10 ft. (3.05 m) of clear space.
• The ceiling fi restop slows spread of fi re and reduces
cold air infi ltration.
• Install a ceiling fi restop whenever chimney penetrates
ceiling/fl oor.
• Mark and cut an opening in ceiling as shown in Figure 5.4.
• Frame the opening with the same size lumber used in
the ceiling joists.
• Nail the ceiling fi restop to the bottom of the ceiling joists
when there is a room above.
• Use an attic insulation shield if the ceiling is insulated.
The ceiling fi restop may then be attached above or below
the joists.
20 Heatilator • Birmingham 42-B Installation Manual • 4059-715 • Rev C • 2/14/13
Ceiling
Firestop
Joint
Band
(Optional)
Ceiling fi restops must be used
ROOM ABOVE (non-insulated ceiling)
B
Ceilng 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.
in.
Catalog #
FS538 17
FS540 17
Figure 5.4 Installing the Ceiling Firestop
WARNING! Risk of Fire! DO NOT seal area between
fi restop opening and chimney pipe except where they en-
ter the attic or leave the warm air envelope of the home
(use 600° F sealant).
A
2 in. (51mm)
clearance
A B
mm in. mm
432 17 432
432 26 660