Amana AOES3030 User Manual download pdf (Page 6)

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.

3’

10’

5’

1’ of Duct 1’

90° Elbow 5'

3’ of Duct 3’

90° Elbow 5'

10’ of Duct 10’

Total Feet 24'

1’

1 foot of 3¼ x 10

inch duct

= 1 equivalent foot

1 foot of

6 inch pipe

= 1 equivalent foot

6 inch to

3¼ x 10 inch transition

= 1 equivalent foot

3¼ x 10 inch to

6 inch transition

= 4½ equivalent feet

6 inch to

3¼ x 10 inch

90 degree transition

= 9 equivalent feet

3¼ x 10 inch to

6 inch

90 degree transition

= 5 equivalent feet

3¼ x 10 inch

90 degree elbow

= 5 equivalent feet

6 inch 90 degree elbow

= 5 equivalent feet

3¼ x 10 inch flat elbow

90° angle

= 12 equivalent feet

6 inch 45 degree elbow

= 2½ equivalent feet

3¼ x 10 inch wall cap

(Unrestricted)

= 0 equivalent feet

6 inch wall cap (Unrestricted)

= 0 equivalent feet

1 2 3 4 5 6

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Amana AOES3030 User Manual Page 6

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