Duct fittings
Installation Preparation
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| 36" Island Vent Hood |
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Use this chart to |
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compute maximum |
| Equivalent | Quantity | Equivalent |
permissable lengths | Duct Piece Dimensions | Length* | Used | Length |
for duct runs to | Round, | 1 ft. |
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outdoors. | straight | (per foot |
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length)
This Hood Must
Use 6" Round Duct It Can Transition to
3-1/4" x 12" Duct
Note: Do not exceed maximum permissable equivalent lengths!
Maximum duct length: 100 foot for range hoods.
Flexible ducting:
If flexible metal ducting is used, all the equivalent feet values in the table should be doubled. The flexible metal duct should be straight and smooth and extended as much as possible.
Do NOT use flexible plastic ducting.
Note: Any home ventilation system, such as a ventilation hood, may interrupt the proper flow of combustion air and exhaust required by fireplaces, gas furnaces, gas water heaters and other naturally vented systems. To minimize the chance of interruption of such naturally vented systems, follow the heating equipment manufacturer’s guidelines and safety standards such as those published by NFPA and ASHRAE.
1 ft. | |
straight | (per foot |
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90° elbow | 15 ft. |
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45° elbow | 9 ft. |
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90° elbow | 15 ft. |
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45° elbow | 9 ft. |
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90° flat elbow | 20 ft. |
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6" round to |
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1 ft. | |
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to 6" round transition | 5 ft. |
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6" round to |
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transition 90° elbow | 5 ft. |
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transition 90° elbow | 15 ft. |
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Round |
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wall cap |
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with damper | 30 ft. |
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with damper | 30 ft. |
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Round |
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roof cap | 26 ft. |
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Round |
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roof vent | 24 ft. |
* Actual length of straight duct plus duct fitting | Total Duct Run |
equivalent. Equivalent length of duct pieces are based |
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on actual tests conducted by GE Evaluation Engineer- |
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ing and reflect requirements for good venting |
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performance with any ventilation hood. |
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