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HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Square termination (SV4.5HT-2) shown
Figure 37
- Side Vent, TWO 90 DEGREE ELBOWS
H
1
When using Secure Flex, use Firestop
/ Spacer SF4.5VF
When using Secure Flex, use Firestop
/ Spacer SF4.5HF
Note:
See Table 11 as an aid in venting
component selection for a particular range
of exterior wall thicknesses.
Square termination (SV4.5HT-2) shown
Figure 38
- Top Vent, TWO 90 DEGREE ELBOWS
22
H 1
V
Spacer (SV4.5HF)
Wall Firestop/
Spacer (SV4.5HF)
Wall Firestop/
Spacer (SV4.5HF)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
H
H
feet
10
15
Wall Firestop/
20
Spacer (SV4.5HF)
Ceiling
Firestop / Spacer
(SV4.5VF)
Wall Firestop/
H
Ceiling Firestop /
Spacer (SV4.5VF)
Table F
Maximum
H Maximum
+H
1
(meter)
feet
(meter)
5
(1.524)
2
(0.610)
(3.048)
4
(1.219)
(4.572)
6
(1.829)
(6.096)
8
(2.438)
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.
Example: If 20 feet of (H + H
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
) horizontal run, up to a maximum
1
horizontal run of 20 feet.
When using Secure Flex, use Firestop /
Spacer SF4.5VF
When using Secure Flex, use Firestop /
Spacer SF4.5HF
Note:
See Table 11 as an aid in venting
component selection for a particular range
of exterior wall thicknesses.
H
Maximum
+ H
1
feet
(meter)
3
(0.914)
5
(1.524)
10
(3.048)
V
15
(4.572)
20
(6.096)
H
V +
+ H
H
+ H
1
Example: If 20 feet of (H + H
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
) horizontal run, up to a maximum
1
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 36.
V Minimum
feet
(meter)
1
(0.305)
2
(0.610)
3
(0.914)
4
(1.219)
) horizontal
1
Table G
V Minimum
feet
(meter)
Elbow Only
1
(0.305)
2
(0.610)
3
(0.914)
4
(1.219)
= 40 feet (12.2 m) Max.
1
= 20 ft. (6.096 m) Max.
) horizontal
1
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