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HORIZONTAL VENT FIGURES/TABLES (CONTINUED)
H 1
V
Square termination (SV4.5HT-2) shown.
Figure 37
- Rear Vent - TWO 90 DEGREE ELBOWS
H 1
Square termination (SV4.5HT-2) shown.
See Table 12 on Page 21 as an aid in venting
component selection for a particular range of
exterior wall thicknesses.
Figure 38
- Top Vent - TWO 90 DEGREE ELBOWS
22
H
Wall
Firestop/Spacer
(SV4.5HF)
Ceiling
Firestop/Spacer
(SV4.5VF)
Wall Firestop/Spacer
(SV4.5HF)
H
Wall Firestop/Spacer
(SV4.5HF)
Ceiling
Firestop/Spacer
(SV4.5VF)
Example: If 20 feet of (H + H
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 horizontal run of 20 feet.
1
An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component
in the system. See Figure 35.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Table H
H
Maximum
H Maximum
+H
1
feet
(meter)
feet
(meter)
5
(1.524)
2
(0.610)
10
(3.048)
4
(1.219)
15
(4.572)
6
(1.829)
20
(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
) horizontal vent run is needed,
1
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
to a maximum horizontal run of 20 feet.
See Table 12 on Page 21 as an aid in venting component
selection for a particular range of exterior wall thick-
nesses.
H
+ H
Maximum
1
feet
(meter)
3
(0.914)
5
(1.524)
V
10
(3.048)
15
(4.572)
20
(6.096)
H
V +
+ H
= 40 feet (12.2 m) Max.
1
H
+ H
= 20 ft. (6.096 m) Max.
1
) horizontal vent run is needed, then 4 feet minimum of (V) vertical
1
V Minimum
feet
(meter)
1
(0.305)
2
(0.610)
3
(0.914)
4
(1.219)
) horizontal run, up
1
Table J
V Minimum
feet
(meter)
Elbow Only
1
(0.305)
2
(0.610)
3
(0.914)
4
(1.219)
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