Vent Termination Location Requirements; Flashing And Storm Collar Installation - Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual

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 1 ft. (0.3 m) (center to
center).
See table 9. for the following two conditions:
For sloped roof applications with distance b greater than
g
18 in. (450 mm)
For flat roof applications
g
Fig. 21
Fig. 23
26
(continued)
Table 9
Vent system
60/100
80/125
100/150
110/160
*(See vent manufacturer's specifications).
* 1 See WARNING below.
WARNING
Vent termination must be at least 12 in. (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 in. (450 mm) above the highest point where it passes
through the roof and any other obstruction within a
horizontal distance of 18 in. (450 mm).
Fig. 22
For sloped roof applications with distance b less than
g
18 in. (450 mm)
a minimum 18 in. (450 mm)
b <18 in. (450 mm)
Rigid Venting Systems Installation Instructions
1 ft. (0.3 m)
a (min. distance) *
25 in. (635 mm)
25 in. (635 mm)
30 in. (762 mm)