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Installation - Ductwork Calculation Sheet
3 1/4 ” x 10”
Rect.,
straight
6 ” Round,,
straight
7", 8”
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", 8" round
90° elbow
7", 8" round
45° elbow
7", 8" Round
wall cap
with damper
7", 8"
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.
Note: Do not use smaller size duct than specified.