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I
Duct Length Piece Equivalents
31/4x 10 inch to 6 inch
transition = 4½ equivalent
feet
31/4x 10 inch to 6 inch 90
degree transition =
5 equivalent feet
31Ax 10 inch 90 degree
elbow = 5 equivalent feet
31/4x 10 inch flat elbow =
12 equivalent feet
31/4x 10 inch wall cap
(Unrestricted) =
0 equivalent feet
1 foot of 31¼x 10 inch duct = 1 equivalent foot
1 foot of 6 inch pipe = 1 equivalent foot
6 inch to 31/4x 10 inch
transition =
1 equivalent foot
6 inch to 31/4x 10 inch 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
11
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