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PLANNING THE INSTALLATION
Duct pieces
3- 1/ 4" x 10"
Rect.,
straight
6", 7", 8", 10"
Round,
straight
3- 1/ 4" x 10"
Rect. 90º
elbow
3- 1/ 4" x 10"
Rect. 45º
elbow
3- 1/ 4" x 10"
Rect. 90º
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
º
6", 7", 8", 10"
Round,
45º elbow
Maximum Duct Length: For satisfactory air
movement, the total duct length sho uld not e x ceed
100 equivalent feet.
Equivalent
number
Total
length x 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.
Ft.
Duct pieces
3- 1/ 4" x 10"
Rect. to
6" round
transition
3- 1/ 4" x 10"
Rect. to
6" round
transition 90°
elbow
6" round to
3- 1/ 4" x 10"
rect.
transition
6" round to
3- 1/ 4" x 10"
rect.
transition 90°
elbow
7" round to
3 1/ 4" x 10"
rect.
transition
7" round to 3-
1/ 4" x 10"
rect.
transition
900 elbow
3- 1/ 4" x 10"
Rect.
wall cap
with damper
6", 7", 8", 10"
Round, wall
cap with
damper
6", 7", 8", 10"
Round
roof cap
-10-
Equivalent
number
Total
length x used =
5 Ft.
x (
) =
Ft..
20 Ft.
x (
) =
Ft.
1 Ft.
x (
) =
Ft.
16 Ft.
x (
) =
Ft.
8 Ft.
x (
) =
Ft.
23 Ft.
x (
) =
Ft.
30 Ft.
x (
) =
Ft.
30 Ft.
x (
) =
Ft.
30 Ft.
x (
) =
Ft.
Ft..
Subtotal column 2 =
Subtotal column 1 =
Ft.
Ft.
Total ductwork =
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