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8
Equivalent duct length table
To calculate your equivalent duct length:
1 Write the number of sections used for each of the duct pieces.
2 Multiply the number used by the equivalent length for each duct piece.
3 Add the total equivalent lengths together. This number must be less than 140 ft. (42.7 m)
Duct Pieces Equivalent
Length
× Number Used = Total Equivalent
Length
5 ft. (1.5 m) × ( ) = ft. or m
40 ft. (12.2 m) × ( ) = ft. or m
10 ft. (3 m) × ( ) = ft. or m
5 ft. (1.5 m) × ( ) = ft. or m
25 ft. (7.6 m) × ( ) = ft. or m
5 ft. (1.5 m) × ( ) = ft. or m
24 ft. (7.3 m) × ( ) = ft. or m
1 ft. (.3 m) × ( ) = ft. or m
Total ductwork =
ft. or m
(For proper airflow, this
number should not
exceed 140 ft.)
Rectangular-to-
round transition
adapter
Wall cap
90° elbow
45° elbow
90° elbow
45° elbow
Roof cap
Straight duct 6” round
OR
3-1/4” × 10” rectangular
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