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Cut and frame the interior wall where the exhaust vent will go. If the wall the vent goes through is made of
a non-combustible material, an Ø 9½ in. (Ø 24.2 cm) hole is sufficient for a flexible duct; the fireguard will
not be required.
The horizontal length of the vent must be level or have a ¼ in. per foot upward slope.
CAUTION: Never allow the vent to go downwards. This could lead to improper exhaust venting and cause
a fire.
A firewall is required at each floor level and wherever the
vent goes through a wall.
Slide the vent toward the wall and carefully insert the pipe
into the vent cap. It is important that the vent pipe overlaps
the vent cap on a minimum of 1 ½ in. (3.8 cm). Fasten both
Figure 3.2.3.5b
parts together using three self-drilling screws.
39
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