NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. 21
Square termination
(SV4.5HT-2) shown.
Wall Firestop / Spacer
(SV4.5HF)
WARNINGUnder no circumstances, may separate sections of
concentric fl exible vent pipe be joined together.
See Table 11 as an aid in venting component selection for a particular
range of exterior wall thicknesses.
Square termination
(SV4.5HT-2) shown.
H
V
H = 28 in. (711 mm)
Maximum
7 in. (711 mm)
21 in. (533 mm)
Maximum
Wall Firestop/
Spacer (SV4.5HF)
When using Secure Flex, use Firestop / Spacer SF4.5VF
When using Secure Flex, use Firestop / Spacer SF4.5HF
Table E
H Maximum V Minimum
feet (meter) feet (meter)
3 (0.914) Elbow Only
5 (1.524) 1 (0.305)
10 (3.048) 2 (0.610)
15 (4.572) 3 (0.914)
20 (6.096) 4 (1.219)
V + H = 40 feet (12.2 m) Max.
H = 20 ft. (6.096 m) Max.
Example: If 20 feet of (H)
horizontal vent run is needed,
then 4 feet minimum of (V)
vertical vent will be required.
This table shows a 1(V) to
5(H) ratio. For every 1 foot
of vertical, you are allowed 5
feet of (H) horizontal run up
to a maximum (H) horizontal
run of 20 feet.
Figure 35 - Side Vent, NO ELBOWS
Figure 36 - Top Vent, ONE 90 DEGREE ELBOW
When using Secure Flex, use Firestop / Spacer SF4.5HF
Square termination (SV4.5HT-2) shown
Venting Components Required for Various Exterior Wall Thick-
nesses, when using Square Termination Kit (SV4.5HT-2)
Vent Components Required Exterior Wall Thickness - inches (mm)
Termination Kit Only 6 to 9-1/4 (152 to 235)
Termination Kit and 6 In. Vent
Section (SV4.5L6) 10-3/4 to 14 (273 to 356)
Termination Kit and 12 in.
Vent Section (SV4.5L12) 16-3/4 to 20 (426 to 508)
Termination Kit and Tele-
scopic Section (SV4.5L12) 11-3/4 to 20 (299 to 508)
Table 11 Note: See Figure 34 showing wall thickness range
when using SV4.5HT-2 termination kit only.
Notes:
• Secure Vent components (rigid vent pipe and terminal) are shown in
the Figures; Secure Flex components (fl exible vent pipe and terminal)
may also be used.
• Two 45 degree elbows may be used in place of one 90 degree elbow.
The same rise to run ratios, as shown in the venting Figures for 90
elbows,must be followed if 45 degree elbows are used.
• SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) fi restop/spacer must
be used anytime vent pipe passes through a combustible fl oor or ceil-
ing. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) fi restop/spacer
must be used anytime vent pipe passes through a combustible wall.
• It is very important that the horizontal/inclined run be maintained
in a straight (no dips) and recommended to be in a slightly elevated
plane, in a direction away from the fi replace of 1/4" rise per foot (20
mm per meter) which is ideal, though rise per foot run ratios that are
smaller are acceptable all the way down to at or near level.
• The tables show a 1(V) to 5(H) ratio up to a maximum horizontal run
of 20 feet except for installations where an elbow is the only vertical
vent section in the system (see Figure 36).
• AN ELBOW IS ACCEPTABLE AS 1 FOOT OF VERTICAL RISE EXCEPT
WHERE AN ELBOW IS THE ONLY VERTICAL COMPONENT IN THE
SYSTEM. See Figure 36.