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HORIZONTAL VENT FIGURES/TABLES (continued)
u
When using Secure Flex, use
Firestop / Spacer SF4.5VF
v
When using Secure Flex, use
Firestop / Spacer SF4.5HF
Note: See Table 8 as an aid in
venting component selection for
a particular range of exterior wall
thicknesses.
H
Maximum
+ H
+ H
1
2
feet
(meter)
5
(1.524)
10
(3.048)
15
(4.572)
20
(6.096)
V + H + H 1 + H 2 = 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H 1 + H 2 = 20 feet (6.096 meters) Max.
Square termination (SV4.5HT-2) shown
Figure 41
- Side Vent, THREE 90 DEGREE ELBOWS
Square termination
(SV4.5HT-2) shown.
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 8 as an aid
in venting component selec-
tion for a particular range of
exterior wall thicknesses.
Figure 42
- Top Vent, THREE 90 DEGREE ELBOWS
24
H 2
Table J
V Minimum
H Maximum
feet
(meter)
feet
(meter)
2
(0.610)
1
(0.305)
4
(1.219)
2
(0.610)
6
(1.829)
3
(0.914)
8
(2.438)
4
(1.219)
H 1
V 1
v
Wall Firestop
/ Spacer (SV4.5HF)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
v
Wall Firestop / Spacer
(SV4.5HF)
H 1
u
Ceiling Firestop /
Spacer (SV4.5VF)
V
u
Ceiling Firestop /
Spacer (SV4.5VF)
H
Example: If 20 feet total (H+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 (V) vertical, you
are allowed 5 feet of horizontal run
up to a maximum total (H+H
horizontal run of 20 feet.
H
Table K
V Minimum
H
Maximum
+ H
1
feet
(meter)
feet
5
(1.524)
Elbow Only
5
(1.524)
1
10
(3.048)
2
15
(4.572)
3
20
(6.096)
4
H
+ H
= 20 feet (6.096 m) Max.
1
V
H
+ V
+
+ H
= 40 ft. (12.192 m) Max.
1
1
Example: If 20 feet total (H+H
vent run is needed, then 4 feet minimum of
(V) vertical vent will be required.
V
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
1
maximum horizontal run of 20 feet.
An elbow is acceptable as 1 foot of verti-
cal rise except where an elbow is the only
vertical component in the system. See
Figure 38.
+H
)
1
2
+H
)
1
2
(meter)
(0.305)
(0.610)
(0.914)
(1.219)
) horizontal
1
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