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Vertical Vent Installation (Coaxial)
Component Installation Guide
Flashing and storm collar installation
Flashings and storm collars are field supplied. Flashings and storm collars suitable for Type B vent materials (or better) may
be used. To obtain flashings and storm collars, please contact your local vent material supplier. Follow the installation
instructions supplied by the manufacturer.
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.).
The distance between two adjacent vertical vent terminations for all boiler sizes is 1ft / 0.3m (center to center).
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. 22
H For sloped roof applications with distance b less than 18"/450 mm
b
a
Fig. 24
28
(continued)
a
Fig. 23
a minimum 18"/450 mm
b <18"/450 mm
Table 13.
Vent system
60/100
a
80/125
100/150
*1
See WARNING below.
WARNING
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 venting
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.
1ft. / 0.3m
a (min.distance)
25"/
*1
635 mm
25"/
*1
635 mm
30"/
*1
762 mm
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