HORIZONTAL VENT FIGURES/TABLES (continued)
H1H
TABLE H
H+H1 Maximum | H Maximum | V Minimum |
feet (meters) | feet (meters) | feet (meters) |
(1.524) |
|
|
*When using Secure Flex, use Firestop/Spacer SF4.5HF
**When using Secure Flex, use Firestop/Spacer SF4.5VF
V
*Wall
Firestop/Spacer
(SV4.5HF)
**Ceiling Firestop/Spacer
(SV4.5VF)
5 |
| 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.
Example: If 20 feet of (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 (H) horizontal run, up to a maximum horizontal run of 20 feet.
See Table 4 on page 18 as an aid in venting component selection for a particular range of exterior wall thicknesses.
Figure 37 - Rear Vent - TWO 90 DEGREE ELBOWS | (Square termination |
H1
*When using Secure Flex, use Firestop/Spacer SF4.5HF
**Note - When using Secure Flex, use Firestop/Spacer SF4.5VF
*Wall Firestop/Spacer |
|
| TABLE J |
| |
(SV4.5HF) |
| H + H1 Maximum | V Minimum | ||
H |
| ||||
| feet | (meters) | feet | (meters) | |
|
| ||||
|
| 3 | (0.914) | Elbow Only | |
| V | 5 | (1.524) | 1 | (0.305) |
| 10 | (3.048) | 2 | (0.610) | |
|
| ||||
|
| 15 | (4.572) | 3 | (0.914) |
*Wall Firestop/Spacer |
| 20 | (6.096) | 4 | (1.219) |
(SV4.5HF) |
| V + H + H1 = 40 feet (12.2 m) Max. | |||
**Ceiling |
|
| H + H1 = 20 ft. (6.096 m) Max. | ||
|
|
|
|
| |
Firestop/Spacer |
|
|
|
|
|
(SV4.5VF) |
|
|
|
|
|
Example: If 20 feet of (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 (H) 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 35. See Table 4 on page 18 as an aid in venting component selection for a particular range of exterior wall thicknesses.
Figure 38 - Top Vent - TWO 90 DEGREE ELBOWS (Square termination
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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