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EQUIVALENT DUCT LENGTH CHART
HR0049
HR0048
HR0047
Straight Duct
8-in. round x 2-ft. long
Equivalent length
2 ft.
Broan Model 643
8-in. Round Wall Cap
Equivalent length
30 ft.
(15-ft. w/o damper)
Broan Model 634 or 644
8-in. Round Roof Cap
Equivalent length
30 ft. (7-ft. w/o damper)
Kenmore range hoods are designed to perform effi ciently when attached to long runs of duct. As a point of reference, this hood
will function at approximately 80% of its rated air performance when 300 equivalent feet of 8” round ductwork is attached. Use
this chart to calculate the equivalent duct length of your system. Note that 8” round is the minimum recommended duct size.
HR0046
8-in. Round Elbow
Equivalent length
10 ft.
Broan Model 639
3¼” x 10” Wall Cap
Equivalent length
90 ft.
(14-ft. w/o damper)
HR0045
Broan Model 401
Straight Duct
3¼” x 10” x 1 ft. long
Equivalent length
4 ft.
HR0050