Top Vent - Horizontal Termination - (continued)
Two Elbows |
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V1 Minimum | H1 + H2 Maximum | ||
Elbow only | Not allowed | ||
6 in. | 152 mm | 2 ft. | 610 mm |
1 ft. | 305 mm | 4 ft. | 1.2 m |
457 mm | 11 ft. | 3.4 m | |
2 ft. | 610 mm | 19 ft. | 3.8 m |
762 mm | 22 ft. | 6.7 m | |
V1 + H1 | + H2 = 40 ft. (12.2 m) Maximum | ||
H1 + H2 = 22 ft. (6.7 m) Maximum | |||
V1 = 1 ft. (305 mm) Minimum |
H2 | H1 |
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INSTALLED
HORIZONTALLY
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| V1 Minimum | H1 + H2 Maximum |
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| Elbow only | Not allowed |
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| 6 in. | 152 mm | Not allowed |
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| 1 ft. | 305 mm | 2 ft. | 610 mm |
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| 2 ft. | 610 mm | 4 ft. | 1.2 m |
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| 3 ft. | 914 mm | 6 ft. | 1.8 m |
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| 4 ft. | 1.2 m | 8 ft. | 2.4 m |
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| 6 ft. | 1.8 m | 12 ft. | 3.6 m |
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| 10 ft. | 3.0 | 20 ft. | 6.1 m |
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| V1 | + H1 | + H2 = 40 ft. (12.2 m) Maximum |
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| H1 + H2 = 20 ft. (6.0 m) Maximum |
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| V1 = 1 ft. (305 mm) Minimum |
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| Note: For corner installations: A 6 inch | |||||
V |
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| before a 90º elbow, to allow the vent | |||||
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| pipe to clear the top standoffs. | |||||
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Figure 7.4
Three Elbows
H2
V1 Min. | H1 Max. |
| V2 Min. | H2 Max. | ||||
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Elbow only | 2 ft. | 610 mm | 0 in. |
| 0 mm | 1 ft. | 305 mm | |
6 in. | 152 mm | 3 ft | 914 mm | 6 in. |
| 152 mm | 2 ft. | 610 mm |
1 ft. | 305 mm | 6 ft. | 1.8 m | 1 ft. |
| 305 mm | 6 ft. | 1.8 m |
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2 ft. | 610 mm | 11 ft.* | 3.4 m* | 2 ft. |
| 610 mm | 10 ft.* | 3.1 m* |
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3 ft. | 914 mm | 16 ft * | 4.9 m* | 3 ft. |
| 914 mm | 14 ft.* | 4.3 m* |
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*H1 + H2 = 20 ft. (6.1 m) Maximum | V1 + V2 + H1 + H2 = 40 ft. (12.2 m) Maximum | |||||||
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V2
H1
V1
Figure 7.5
Heat & Glo • 6000C, | 29 |