Duct Fitting Equivalent Length
| Duct Pipe: | 6” Duct | 7” Duct | 8” Duct | 9” Duct |
90º | Elbow | 8 feet | 9 feet | 10 feet | 11 feet |
90º | Long Radius Elbow | 5 feet | 5 feet | 5 feet | 6 feet |
45º | Elbow | 5 feet | 5 feet | 5 feet | 5 feet |
The following remote air duct information is provided for use in design calculations, if needed.
Remote Air Duct Specifications
Input Mbtu | Required | Max Duct Loss | |
Air (SCFM) | (inches Water) | ||
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1500 | 325 | 0.784 | |
1800 | 390 | 1.11 | |
2000 | 433 | 1.356 |
8.3Remote Combustion Air Cap
A UL Listed air intake vent termination cap MUST be attached to the remote combustion air vent termination to adequately protect the combustion air inlet from wind and weather. A UL Listed air intake termination cap is available from PVI Industries and may have shipped with the water heater as a purchased option.
8.4Vertical or Horizontal Remote Air Duct Termination
∙Air inlet and exhaust vents should terminate in the same wind pressure area whenever possible.
∙Air inlet must be located no less than 3 feet (0.91m) below the exhaust terminal if they are within 10 feet (3.05 m) of each other.
∙If terminating through the roof, the air inlet must terminate at least 12 inches (0.3 m) above roof level and at least 12 inches (0.3 m) above snow levels.
∙If terminating through a sidewall, the air inlet must terminate at least 12 inches (0.3 m) above grade and/or at least 12 inches (0.3 m) above normal snow levels.
Vertical Remote Air |
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8.5Remote Air Consideration for Combined Remote Air Ducting
Each water heater MUST have separate intake piping. Consult factory for common air intake pipe sizing.
17
