7
EQUIVALENT DUCT LENGTH CHART
Straight Duct
3¼-in. x 10-in. x 2-ft. long
Equivalent length
2 ft.
7-in. Round Elbow
Equivalent length
8 ft.
3¼-in. x 10-in.
Right-angle Elbow
Equivalent length
8.5 ft.
3¼-in. x 10-in.
Right-angle Flat Elbow
Equivalent length
24 ft.
3¼-in. x 10-in.
Right-angle
Short Eave
Elbow
Equivalent length
15 ft.
3¼-in. x 10-in.
Right-angle
Long Eave
Elbow
Equivalent length
15 ft.
3¼-in. x 10-in.
Wall Cap
Equivalent
length
45 ft.
(7-ft. w/o
damper)
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 e
ffi
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 30 equivalent feet of 7" round ductwork is attached.
Use this chart to calculate the equivalent duct length of your system.
Straight Duct
7-in. round x 2-ft. long
Equivalent length
2 ft.
3¼-in. x 10-in. to
7-in. Round
Transition
Equivalent length
5.5 ft.
7-in. Round
Wall Cap
Equivalent length
34 ft.
(6-ft. w/o damper)
“Ducting Accessories” available by calling
1-844-553-6667
