Amana AKEF3070 Manual page 29

Duct Length Calculations
Ducting length is calculated in terms of straight metal
duct. Fittings such as elbows or transition pieces should
be limited to 50% of total duct length. Using too many
fittings can cause air flow problems. Maximum allowable
calculated duct length is 60 equivalent feet.
• Use Duct Length Piece Equivalents section provided
below to calculate duct length.
• Do not use any duct other than metal.
• Flexible duct is not recommended because it can
create a fire hazard. However, if it is used, one foot of
flexible duct is equal to two feet of smooth metal duct.
• Exterior exhaust opening must be a minimum of 1 foot
(12 inches) from an obstruction.
Part No. 36-31960101-0
Printed in U.S.A. 01/00
1 foot of 3¼ x 10
inch duct
= 1 equivalent foot
6 inch to
3¼ x 10 inch transition
= 1 equivalent foot
6 inch to
3¼ x 10 inch
90 degree transition
= 9 equivalent feet
3¼ x 10 inch
90 degree elbow
= 5 equivalent feet
3¼ x 10 inch flat elbow
90° angle
= 12 equivalent feet
3¼ x 10 inch wall cap
(Unrestricted)
= 0 equivalent feet
5'
3'
5'
10'
1'
3¼ x 10 inch to
6 inch transition
= 4½ equivalent feet
3¼ x 10 inch to
90 degree transition
= 5 equivalent feet
6 inch 90 degree elbow
= 5 equivalent feet
6 inch 45 degree elbow
= 2½ equivalent feet
6 inch wall cap (Unrestricted)
= 0 equivalent feet
B–7
1'
1' of Duct
90° Elbow
3' of Duct
90° Elbow
10' of Duct
Total Feet
1 foot of
6 inch pipe
= 1 equivalent foot
6 inch
© 2000 Amana Appliances
Amana, Iowa 52204
RS2420004 Rev. 0
1'
5'
3'
5'
10'
24'