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WARNING! Risk of Fire!
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P Traps
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kits, it is recommended that you install a P trap as shown
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if using rigid duct to help prevent air circulation when the
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recommended to use an insulated duct.
24" (610 mm) min.
48" (1220 mm) max.
Seal
4" Duct-Use UL181
Class 0 or Class 1
ducting
Figure 6.4
P Trap Installation Using Flex Pipe
D. Secure Offset/Return
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When offsets and returns are joined to straight pipe sec-
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straps for securing these parts to joists or rafters. See Fig-
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Heatilator • C40-C Constitution Installation Manual • 4186-901 • Rev H • 03/23
Typical CAK Installation
Seal
Note: The pipe
cannot lay on top
of the unit.
Straps
Optional
Additional
Support
Figure 6.5
Secure the Chimney
Ceiling
Firestop
Joint
Band
(Optional)
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