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VERTICAL TERMINATION SYSTEMS (ROOF)
Figure 17, and Figures 29 through 33 on
pages 13 and 14 and their associated Vertical
Vent Tables illustrate the vertical venting con-
figurations that are allowed to be used with
these appliances. Secure Vent pipe applica-
tions are shown in these figures; Secure Flex
pipe may also be used. See page 20 . 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. In the USA, the minimum
vent height above the roof and/or adjacent
walls is specified in ANSI Z223.1(latest edi-
tion); in Canada, by the current CAN-1 B149
installation code. It is also specified in 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 4).
f i r e - p a r t s . c o m
Vertical (Straight) Installation
Determine the number of straight vent sections
required. 4 ¹⁄₂" (114 mm), 10 ¹⁄₂" (267 mm), 22
¹⁄₂" (572 mm), 34 ¹⁄₂" (876 mm) and 46 ¹⁄₂"
(1181 mm) net section lengths are available.
Plan the vent lengths so that a section joint does
not occur within the space defined by ceiling
joists or roof rafters. Refer to the Vent Section
Length Chart.
Figure 17
10
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Vertical (Offset) Installation
Analyze the vent routing and determine the
number of vent sections and elbows required.
Refer to Vertical Vent Figures and Tables on
page 13 and 14 to select the type of vertical
installation desired. Vent sections are available
in net lengths of 4 ¹⁄₂" (114 mm), 10 ¹⁄₂" (267
mm), 22 ¹⁄₂" (572 mm), 34 ¹⁄₂" (876 mm) and 46
¹⁄₂" (1181 mm). Refer to the Vent Section
Length Chart above for an aid in selecting
length combinations.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Elbows are available in 45° and 90° configu-
rations. Refer to Figure 24 on 12 for the
SV4.5E45 and SV4.5E90 elbow dimensional
specifications.
Where required, a telescopic vent section
(SV4.5LA) may be used to provide the installer
with an option in installing in tight and con-
fined spaces or where the vent run made up of
fixed length pieces develops a joint in a unde-
sirable location, or will not build up to the
required length.
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