7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
H1
V
V1
H
Table C
H
+H
Maximum
H
Maximum
V Minimum
feet
(meter)
feet
(meter)
feet
(meter)
5
(.524)
2
(0.60)
(0.305)
0
(3.048)
4
(.29)
2
(0.60)
5
(4.572)
6
(.829)
3
(0.94)
20
(6.096)
8
(2.438)
4
(.29)
V + V + H + H = 40 feet (2.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H = 20 feet (6.096 meters) Max.
Table D
H +
H
Maximum
V Minimum
feet
(meter)
feet
(meter)
5
(.524)
Elbow Only
5
(.524)
(0.305)
0
(3.048)
2
(0.60)
5
(4.572)
3
(0.94)
20
(6.096)
4
(.29)
H + H
= 20 feet (6.096 m) Max.
V + V
+ H + H
= 40 ft. (2.92 m) Max.
Example:
If 20 feet total (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 total horizontal run of 20 feet.
V
H1
H
V1
u
Ceiling
Firestop / Spacer
(SV4.5VF)
v
Wall Firestop/
Spacer (SV4.5HF)
Example:
If 20 feet total (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 total 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 30
- Side Vent - THREE ELBOWS
Figure 31-
Top Vent - THREE ELBOWS
u
When using Secure Flex, use Firestop / Spacer SF4.5VF
v
When using Secure Flex, use Firestop / Spacer SF4.5HF
u
When using Secure Flex, use Firestop / Spacer SF4.5VF
v
When using Secure Flex, use Firestop / Spacer SF4.5HF
u
Ceiling Firestop /
Spacer (SV4.5VF)
u
Ceiling Firestop /
Spacer (SV4.5VF)
v
Wall Firestop/
Spacer (SV4.5HF)
VERTICAL VENT FIGURES / TABLES (CONTINUED)
