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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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SV4.5CGV-1
Termination
SV4.5FA OR
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
*SV4.5VF
Firestop/Spacer
SV4.5L6/12/24/36/48
Vent Sections
40' Max
(12.2 M)
1" (25.4 mm)
Minimum
Clearance to
Combustibles
*When using Secure Flex,
use Firestop/Spacer
SF4.5VF
Figure 21
VERTICAL TERMINATION SYSTEMS (ROOF)
Figure 21, and Figures 32 through 36 on
pages 14 and 15
and their associated Vertical
Vent Tables illustrate the vertical venting con-
figurations that are allowed to be used with these
appliances. Secure Vent pipe applications are
shown in these figures; Secure Flex pipe may
also be used.
See page 21
. A Vertical Vent Table
summarizes each system’s minimum and maxi-
mum vertical and horizontal length values that
can be used to design and install the vent com-
ponents 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).
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.