Direct Vent - Vertical
Note: When vertical height exceeds 25 ft, consult
factory prior to installation.
*Requires optional vent tee for rear discharge.
Fig. 41: Direct Vent - Vertical
| Certified |
| Vertical Venting | Combustion Air | Air Inlet | ||
Model | Venting | Vent Size | Height* | Intake Pipe | Max. Length** | ||
| Material |
| Min. | Max. | Material | 6” | 8” |
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302B |
| 5” |
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| 100’ | N/A |
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402B |
| 6” |
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| Galvanized Steel, | ||
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502B |
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| 75’ |
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Category II |
| 5’ | 25’ | PVC, |
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652B | or IV |
| ABS, |
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| CPVC |
| 100’ | |
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| 8” |
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| 40’ | ||
752B |
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902B |
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*Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details. When vertical height exceeds 25 ft, consult factory prior to installation.
** Subtract 10 ft per elbow. Max. 3 elbows.
Maximum combustion air duct length terminated at 100 equivalent ft.
Table V: Category II or IV Vertical Venting
44
