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