Kenmore 31133 Equivalent Duct Length Chart, 2 ft, 4 ft, 10 ft, 30 ft, 90 ft, 8-in. Round Elbow

EQUIVALENT DUCT LENGTH CHART

Kenmore range hoods are designed to perform efficiently 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.

HR0047

Straight Duct

8-in. round x 2-ft. long

Equivalent length

2 ft.

HR0045

Broan Model 401

Straight Duct

3¼” x 10” x 1 ft. long

Equivalent length

4 ft.

HR0046

8-in. Round Elbow

Equivalent length

10 ft.

HR0048

Broan Model 643

8-in. Round Wall Cap

Equivalent length

30 ft.

(15-ft. w/o damper)

HR0049

Broan Model 634 or 644 8-in. Round Roof Cap

Equivalent length

30ft. (7-ft. w/o damper)

HR0050

Broan Model 639 3¼” x 10” Wall Cap

Equivalent length

90 ft.

(14-ft. w/o damper)

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