HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
H1
H
Table H
H+H1 Maximum | H Maximum | V Minimum | |||
feet | (meter) | feet | (meter) | feet | (meter) |
5 | (1.524) | 2 | (0.610) | 1 | (0.305) |
�When using Secure Flex, use Firestop/Spacer SF4.5VF.
�When using Secure Flex, use Firestop/Spacer SF4.5HF.
V
�Wall
Firestop/Spacer
(SV4.5HF)
�Ceiling
Firestop/Spacer
(SV4.5VF)
10 | (3.048) | 4 | (1.219) | 2 | (0.610) |
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15 | (4.572) | 6 | (1.829) | 3 | (0.914) |
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20 | (6.096) | 8 | (2.438) | 4 | (1.219) |
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| V + H + H1 | = 40 feet (12.2 m) Max |
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| H = 8 feet (2.438 meters) Max. |
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H + H1 = 20 feet (6.096 meters) Max.
Example: If 20 feet of (H + H1) 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+ H1) horizontal run, up to a maximum horizontal run of 20 feet.
See Table 12 on Page 19 as an aid in venting component selection for a particular range of exterior wall thick- nesses.
Square termination
Figure 39 - Rear Vent - TWO 90 DEGREE ELBOWS
�Wall Firestop/Spacer (SV4.5HF)
H
H1
�Note - When using |
| |
Secure Flex, use | Wall Firestop/Spacer | |
Firestop/Spacer SF4.5VF. | ||
� | ||
�When using Secure Flex, | (SV4.5HF) | |
| ||
use Firestop/Spacer | �Ceiling | |
SF4.5HF. | ||
| Firestop/Spacer | |
| (SV4.5VF) |
Square termination
See Table 12 on Page 19 as an aid in venting component selection for a particular range of exterior wall thicknesses.
Figure 40 - Top Vent - TWO 90 DEGREE ELBOWS
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| Table J |
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| H + H1 Maximum |
| V Minimum |
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| feet |
| (meter) |
| feet | (meter) |
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| 3 |
| (0.914) |
| Elbow Only |
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| 5 |
| (1.524) |
| 1 | (0.305) |
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V |
| 10 |
| (3.048) |
| 2 | (0.610) |
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| 15 |
| (4.572) |
| 3 | (0.914) |
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| 20 |
| (6.096) |
| 4 | (1.219) |
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| V + H + H1 = 40 feet (12.2 m) Max. |
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| H + H1 = 20 ft. (6.096 m) Max. |
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| Example: If 20 feet of (H + H1) 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+ H1) horizontal run, up | |||||||
| to a maximum horizontal run of 20 feet. |
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An elbow is acceptable as 1 foot of vertical rise except where an elbow is the only vertical component in the system. See Figure 37.
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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
