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6
EQUIVALENT DUCT LENGTH CHART
Broan Model 401
Straight Duct
3¼-in. x 10-in. x 2-ft. long
Equivalent length
2 ft.
Broan Model 415
7-in. Round Elbow
Equivalent length
8 ft.
Broan Model 428
3¼-in. x 10-in.
Right-angle Elbow
Equivalent length
8.5 ft.
Broan Model 429
3¼-in. x 10-in.
Right-angle Flat Elbow
Equivalent length
24 ft.
Broan Model 430
3¼-in. x 10-in.
Right-angle
Short
Eave Elbow
Equivalent length
15 ft.
Broan Model 431
3¼-in. x 10-in.
Right-angle
Long
Eave Elbow
Equivalent length
15 ft.
Sears Model
59391
3¼-in. x
10-in.
Wall Cap
Equivalent
length
45 ft.
(7-ft. w/o
damper)
Sears
Model 59091
Roof Cap
(accepts 7-in. round
or 3¼-in. x 10-in. duct)
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 fl ow when 25 equivalent feet of 7" round ductwork is
attached. Use this chart to calculate the equivalent duct length of your system.
Broan Model 407
Straight Duct
7-in. round x 2-ft. long
Equivalent length
2 ft.
Broan Model 412H
3¼-in. x 10-in. to
7-in. Round
Transition
Equivalent length
5.5 ft.
Broan Model 647
7-in. Round
Wall Cap
Equivalent length
34 ft.
(6-ft. w/o damper)
Sears Model “Ducting Accessories” available by calling:
Sears at 1-800-4-MY-HOME
®
Broan Model “Ducting Accessories” available by calling:
1-800-558-1711.
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