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INSTALLATION INSTRUCTIONS
DUCT LENGTH CALCULATOR
Use the chart below to calculate the total length of the duct work being installed. The total length should not
exceed 140 feet.
DUCT PIECES
Rectangular to round
transition adapter
Wall cap
Round 90° elbow
Round 45° elbow
Rectangular 90° elbow
Rectangular 45° elbow
Roof cap
Straight duct 6" round or
3 1/4" x 10" rectangular
EQUIVALENT
X NUMBER USED
LENGTH
5 ft
X
40 ft
X
10 ft
X
5 ft
X
25 ft
X
5 ft
X
24 ft
X
1 ft
X
10
EQUIVALENT LENGTH
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(
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=
(
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=
(
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=
(
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(
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(
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(
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TOTAL LENGTH =
ft
ft
ft
ft
ft
ft
ft
ft
ft
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