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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
23
H
1
V
H
u Ceiling Firestop
/ Spacer (SV4.5VF)
v
Wall Firestop/
Spacer (SV4.5HF)
Table F
H
+H
1
Maximum H
Maximum
V Minimum
feet (meter) feet (meter) feet (meter)
5 (1.524) 2 (0.610) 1 (0.305)
10 (3.048) 4 (1.219) 2 (0.610)
15 (4.572) 6 (1.829) 3 (0.914)
20 (6.096) 8 (2.438) 4 (1.219)
V + H + H
1
= 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H
1
= 20 feet (6.096 meters) Max.
Figure 38 - Side Vent, TWO 90 DEGREE ELBOWS
Square termination
(SV4.5HT-2) shown
u When using Secure Flex, use Firestop /
Spacer SF4.5VF
v When using Secure Flex, use Firestop /
Spacer SF4.5HF
Note: See Table 8 on Page 22 as an aid in
venting component selection for a particular
range of exterior wall thicknesses.
Example: If 20 feet of (H + H
1
) 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 (V) vertical, you are allowed 5 feet
of (H+ H
1
) horizontal run, up to a maximum
horizontal run of 20 feet.
V
H
H
1
Table G
H
+ H
1
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 + H
1
= 40 feet (12.2 m) Max.
H + H
1
= 20 ft. (6.096 m) Max.
u When using Secure Flex, use Firestop /
Spacer SF4.5VF
v When using Secure Flex, use Firestop /
Spacer SF4.5HF
Note: See Table 8 on Page 22 as an aid in
venting component selection for a particular
range of exterior wall thicknesses.
u Ceiling Firestop /
Spacer (SV4.5VF)
v Wall Firestop/
Spacer (SV4.5HF)
v Wall Firestop/
Spacer (SV4.5HF)
Example: If 20 feet of (H + H
1
) 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 (V) vertical, you are allowed 5 feet
of (H+ H
1
) horizontal run, up to a maximum
horizontal run of 20 feet.
An elbow is acceptable as 1 foot of vertical
rise except where an elbow is the only vertical
component in the system. See Figure 37.
Figure 39 - Top Vent, TWO 90 DEGREE ELBOWS
Square termination (SV4.5HT-2) shown
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)