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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
22
H1
V
H
V
H
H1
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 + H1 = 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H1 = 20 feet (6.096 meters) Max.
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.
v
Wall Firestop/
Spacer (SV4.5HF)
u
Ceiling
Firestop / Spacer
(SV4.5VF)
u
When using Secure Flex, use Firestop
/ Spacer SF4.5VF
v
When using Secure Flex, use Firestop
/ Spacer SF4.5HF
Note:
See
Table 9
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)
u
When using Secure Flex, use Firestop /
Spacer SF4.5VF
v
When using Secure Flex, use Firestop /
Spacer SF4.5HF
Note:
See
Table 9
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.
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 36.
Figure 37
-
Side Vent, TWO 90 DEGREE ELBOWS
Figure 38
-
Top Vent, TWO 90 DEGREE ELBOWS
Square termination
(SV4.5HT-2) shown
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Square termination (SV4.5HT-2) shown
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