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12 PLANNING THE INSTALLATION
Ducting Calculation Sheet
Duct pieces
Equivalent
length x number
used =
Total
3-1/4" x 10"
Rect.,
straight
1 Ft. x ( ) = Ft.
6" Round,
straight
1 Ft. x ( ) = Ft.
7"-10"
Round,
straight
1 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.90˚
elbow
15 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.45˚
elbow
9 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.90˚
atelbow
24 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.
wall cap
with damper
30 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.to
6" round
transition
5 Ft. x ( ) = Ft.
3-1/4" x 10"
Rect.to
6" round
transition
90˚elbow
20 Ft. x ( ) = Ft.
6" Round,
90˚elbow
15 Ft. x ( ) = Ft.
6" Round,
45˚elbow
9 Ft. x ( ) = Ft.
Subtotal column 1 = Ft.
Duct pieces
Equivalent
length x number
used =
Total
6" Round
wall cap
with damper
30 Ft. x ( ) = Ft.
6" Round,
roof cap
30 Ft. x ( ) = Ft.
6" round to
3-1/4" x 10"
rect.
transition
1 Ft. x ( ) = Ft.
6" round to
3-1/4" x 10"
rect.
transition
90˚elbow
16 Ft. x ( ) = Ft.
7" - 10"
Round,
90˚elbow
15 Ft. x ( ) = Ft.
7" - 10"
Round,
45˚elbow
9 Ft. x ( ) = Ft.
7" - 10"
Round wall
cap with
damper
30 Ft. x ( ) = Ft.
7" - 10"
Round,
roof cap
30 Ft. x ( ) = Ft.
7" round to
3-1/4" x 10"
rect.
transition
8 Ft. x ( ) = Ft.
7" round to
3-1/4" x 10"
rect.
transition
90˚elbow
23 Ft. x ( ) = Ft.
Subtotal column 2 = Ft.
Subtotal column 1 = Ft.
Total ductwork = Ft.
Maximum Duct Length: For satisfactory air
movement, the total duct length should not exceed
100 equivalent feet.
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