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English22
Installation instructions
Installation instructions
Duct-Length Calculation Table
The type of duct determines the hood’s maximum straight duct length.
To determine your maximum length, start with the duct run’s total max. length, then
subtract all of the ductwork equivalent lengths. (See the chart.)
Duct Type Max. Duct Run
8-in. Round 60 feet
10-in. Round
50 feet
3 1/4-in x 10-in Rectangular
Ductwork Equivalent Lengths
For each new elbow and transition, you must subtract “equivalent lengths” from your total
maximum duct run length to compensate for wind resistance.
Piece Subtract
8” 90° Elbow 7 feet
8” 45° Elbow 3 feet
10” 90° Elbow 5 feet
10” 45° Elbow 2 feet
3” x 10” to Round 90° Transition 25 feet
3 1/4” x 10” to 8”/10” Round Transition 4 feet
Wall Cap w/Damper
*
Roof Cap
*Equivalent lengths of roof and wall caps vary with model and configuration.
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