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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
18
H1
V
V1
H
V
H
1
H
V
1
Ceiling
Firestop / Spacer
(SV4.5VF)
Ceiling
Firestop / Spacer
(SV4.5VF)
Wall Firestop/
Spacer (SV4.5HF)
Wall Firestop/
Spacer (SV4.5HF)
Ceiling
Firestop / Spacer
(SV4.5VF)
Example: If 20 feet total (H+H
1
)
horizontal vent run is needed,
then 4 feet minimum of (V) verti-
cal vent will be required.
This table shows a 1(V) to 5(H)
ratio. For every 1 foot of (V)
vertical run, you are allowed 5
feet of (H) horizontal run up to a
maximum (H+H
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 35.
Table D
H +
H
1
Maximum
V Minimum
feet (meter) feet (meter)
5 (1.524) 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)
H + H
1
= 20 feet (6.096 m) Max.
V + V
1
+ H + H
1
= 40 ft. (12.192 m) Max.
Table C
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 + V
1
+ 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 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.
When using Secure Flex, use Firestop / Spacer SF4.5VF
When using Secure Flex, use Firestop / Spacer SF4.5HF
When using Secure Flex, use Firestop / Spacer SF4.5VF
When using Secure Flex, use Firestop / Spacer SF4.5HF
Figure 29 - Rear Vent - THREE ELBOWS
Figure 30 - Top Vent - THREE ELBOWS
VERTICAL VENT FIGURES/TABLES
(CONTINUED)