Figure 17 – TOA Electronics DIRECT VENT 600 User Manual
Page 10
10
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Figure 17
VERTICAL TERMINATION SYSTEMS (ROOF)
Figure 17, and Figures 27 through 31 on
pages 13 and 14 and their associated
Vertical Vent Tables illustrate the various verti-
cal 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 minimum
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 speci-
fied in ANSI Z223.1-(latest edition) (In Canada,
the current CAN-1 B149 installation code) by
major building codes. Always consult your
local codes for specific requirements. A gen-
eral 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
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 joint does not occur at the
intersection of ceiling or roof joists. Refer to
the Vent Section Length Chart.
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SV4.5CGV-1
Termination
SV4.5FA OR
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
*SV4.5BF
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
SF4.5BF