9
www.zephyronline.com
Inst
allation
-
D
uctwork
Calculation
Sheet
3 1/4 x 10
Rect.,
straight
7 Round,,
straight
7 Round,,
straight
3 1/4 x 10
Rect.90°
elbow
3 1/4 x 10
Rect.45°
elbow
3 1/4 x 10
Rect.90°
flat elbow
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
90° elbow
6 Round,,
90° elbow
6 Round,,
45°elbow
1 Ft.
x (
) =
1 Ft.
x (
) =
1 Ft.
x (
) =
15 Ft. x (
) =
9 Ft.
x (
) =
24 Ft. x (
) =
30 Ft. x (
) =
5 Ft.
x (
) =
15 Ft. x (
) =
15 Ft. x (
) =
9 Ft.
x (
) =
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
6" Round
wall cap
with damper
6 Round,
roof cap
6 Round to
3 1/4 x 10
rect.
transition
6 Round to
3 1/4 x 10
rect.
transition
90° elbow
7" round
90° elbow
7" round
45° elbow
6" Round
wall cap
with damper
6 Round,
roof cap
7 Round to
3 1/4 x 10
rect.
transition
6 Round to
3 1/4 x 10
rect.
transition
90° elbow
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 (
) =
15 Ft. x (
) =
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Duct pieces
Equivalent number
lenght x used =
Total
Duct pieces
Equivalent number
lenght x used =
Total
Subtotal column 2 =
Subtotal column 2 =
Total ductwork
=
Subtotal column 1 =
Maximum Duct Length:
For satisfactory air movement, the total
duct length should not exceed 100 equivalent feet.
