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Vent termination location requirements
The vent must be installed observing local regulations in addition to National Codes, CAN/CSA-B149.1 or 2 (for installations
in Canada) or ANSI-Z223.1 or NFPA 54 (for installations in the U.S.A.).
See table below for the following two conditions.
H For sloped roof applications with distance b greater than 18"/450 mm
H For flat roof applications
b
Fig. 1
H For sloped roof applications with distance b less than 18"/450 mm
b
a
Fig. 3
a
Fig. 2
a minimum 18"/450 mm
b <18"/450 mm
Model No.
24C/24/32
WB2-
(5" system)
a (min.
25"/
a
distance)
635 mm
*1
See WARNING below.
WARNING
The vent termination must be at least
12"/300 mm above the anticipated snow
level (consult your local building authorities
or local weather office). Locate vent
termination in such a way that it cannot
be blocked by snow.
A vent used in a special vent system with
positive vent pressure and passing through
a roof shall extend at least 18"/450 mm
above the highest point where it passes
through the roof and any other obstruction
within a horizontal distance of 18"/450 mm.
Venting Option
44/60
(6" system)
30"/
*1
*1
762 mm
21
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