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Select Venting System - Horizontal or Vertical
With the appliance secured in framing, deter-
mine vent routing and identify the exterior
termination location. The following sections
describe vertical (roof) and horizontal (exterior
wall) vent applications. Refer to the section
relating to your installation. A list of approved
venting components is shown in the tables on
pages 24 and 25.
VERTICAL TERMINATION SYSTEMS (ROOF)
Figures 13, and Figures 23 through 27 on
pages 12 to 13 and their associated
Vertical Vent Tables illustrate the various ver-
tical venting configurations that are possible
for use with these appliances. Secure Vent
pipe applications are shown in these figures;
Secure Flex pipe may also be used. A Vertical
Vent Table summarizes each system's mini-
mum and maximum vertical and horizontal
length values that can be used to design and
install the vent components in a variety of
applications. Both these vertical vent systems
terminate through the roof. The minimum
vent height above the roof and/or adjacent
walls is specified in ANSI Z223.1-(latest edi-
tion) (In Canada, the current CAN-1 B149
installation code) by major building codes.
Always consult your local codes for specific
requirements. A general guide to follow is the
Gas Vent Rule (refer to Figure 4 on page 5).
Vertical (Straight) Installation
Determine the number of straight vent sections
required. 4 " (114 mm), 10 " (267 mm), 22
" (572 mm), 34 " (876 mm) and 46 " (1181
mm) net section lengths are available. Plan the
vent lengths so that a joint does not occur at the
intersection of ceiling or roof joists. Refer to
the Vent Section Length Chart.
Figure 13
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