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