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Installation Instructions
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.
8
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,
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
elbow
6" round to
3- 1/ 4" x 10"
Ft.
rect.
transition
6" round to
3- 1/ 4" x 10"
Ft.
rect.
transition
90
0
elbow
7" round to
3 1/ 4" x 10"
Ft.
rect.
transition
7" round to
3- 1/ 4" x 10"
rect.
Ft.
transition
90
0
elbow
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.
Tornado Mini Use, Care, and Installation Guide
TO R N A D O M I N I
Equivalent number
length x used
=
Total
5 Ft.
x (
) =
20 Ft.
x (
) =
1 Ft.
x (
) =
16 Ft.
x (
) =
8 Ft.
x (
) =
23 Ft.
x (
) =
30 Ft.
x (
) =
30 Ft.
x (
) =
30 Ft.
x (
) =
Subtotal column 2 =
Subtotal column 1 =
Total ductwork
=
C O R E
I N S E R T
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
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