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Ducting Calculation Sheet
Duct pieces
3- 1/ 4" x 10"
Rect.,
straight
6", 7", 8", 10"
Round,
straight
3- 1/ 4" x 10"
0
Rect. 90
elbow
3- 1/ 4" x 10"
Rect. 45
0
elbow
3- 1/ 4" x 10"
Rect. 90
0
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
0
elbow
6", 7", 8", 10"
Round,
45
0
elbow
Maximum Duct Length:
the total duct length should not exceed 150 equivalent feet.
Breeze I & Breeze II Use, Care, and Installation Guide
Equivalent number
length x used
=
Total
1 Ft.
x (
) =
1 Ft.
x (
) =
15 Ft.
x (
) =
9 Ft.
x (
) =
24 Ft.
x (
) =
25 Ft.
x (
) =
15
Ft.
x (
) =
15 Ft.
x (
) =
9 Ft.
x (
) =
Subtotal column 1 =
For satisfactory air movement,
Installation Instructions
Duct pieces
Ft.
3- 1/ 4" x 10"
Rect. to
6" round
transition
Ft.
3- 1/ 4" x 10"
Rect. to
6" round
transition
Ft.
90
0
6" round to
3- 1/ 4" x 10"
Ft.
rect.
transition
6" round to
3- 1/ 4" x 10"
Ft.
rect.
transition
90
0
7" round to
3 1/ 4" x 10"
Ft.
rect.
transition
7" round to
3- 1/ 4" x 10"
rect.
Ft.
transition
90
0
3- 1/ 4" x 10"
Rect.
wall cap
Ft.
with damper
6", 7", 8", 10"
Round, wall
cap with
damper
Ft.
6", 7", 8", 10"
Round
roof cap
Ft.
Equivalent number
length x used
=
5 Ft.
x (
) =
20 Ft.
x (
) =
elbow
1 Ft.
x (
) =
16 Ft.
x (
) =
elbow
8 Ft.
x (
) =
23 Ft.
x (
) =
elbow
30 Ft.
x (
) =
30 Ft.
x (
) =
30 Ft.
x (
) =
Subtotal column 2 =
Subtotal column 1 =
Total ductwork
Total
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
=
Ft.
11
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