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10 INSTALLATION
Ducting Calculation Sheet
Maximum duct length: For satisfactory air movement, the total duct length should not exceed 150
equivalent feet.
Duct pieces
3 1/4" x 10"
Rect., straight
6", 7", 8", 10"
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
7" to 6" or 8" to
7" Round
tapered
reducer
6", 7", 8"
Round in-line
damper
6", 7", 8", 10"
Round, 90°
elbow
6", 7", 8", 10"
Round,45°
elbow
Equivalent
length x
Total
number
used =
1 Ft. x ( ) =
Ft.
1 Ft. x ( ) =
Ft.
15 Ft. x ( ) =
Ft.
9 Ft. x ( ) =
Ft.
24 Ft. x ( ) =
Ft.
25 Ft. x ( ) =
Ft.
15 Ft. x ( ) =
Ft.
15 Ft. x ( ) =
Ft.
9 Ft. x ( ) =
Ft.
Subtotal column 1 =
Ft.
Equivalent
length x
Duct pieces
number
used =
3 1/4" x 10"
Rect. to 6"
5 Ft. x ( ) =
Round
transition
3 1/4" x 10"
Rect. to 6"
Round
20 Ft. x ( ) =
transition 90°
elbow
6" Round to 3
1/4" x 10"
1 Ft. x ( ) =
Rect.
transition
6" Round to 3
1/4" x 10"
Rect.
16 Ft. x ( ) =
transition 90°
elbow
7" Round to 3
1/4" x 10"
8 Ft. x ( ) =
Rect.
transition
7" Round to 3
1/4" x 10"
Rect.
23 Ft. x ( ) =
transition 90°
elbow
3 1/4" x 10"
Rect. wall cap
30 Ft. x ( ) =
with damper
6", 7", 8", 10"
Round, wall
30 Ft. x ( ) =
cap with
damper
6", 7", 8", 10"
Round, roof
30 Ft. x ( ) =
cap
Subtotal column 2 =
Subtotal column 1 =
Total ductwork =
Total
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
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