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WORKSHEET—CALCULATE TOTAL EQUIVALENT DUCTWORK LENGTH
DUCT
EQUIVALENT NUMBER
PIECES
LENGTH
" x 10"
3
1
⁄
1 Ft.
4
Rect.,
straight
7" Round,
1 Ft.
straight
6" Round,
1 Ft.
straight
" x 10"
3
⁄
14 Ft.
1
4
Rect. 90°
elbow
" x 10"
3
⁄
8 Ft.
1
4
Rect. 45°
elbow
" x 10"
3
1
⁄
33 Ft.
4
Rect. 90°
flat elbow
" x 10"
3
1
⁄
24 Ft.
4
Rect.
(18 ft. w/o
wall cap
damper)
with
damper
" x 10"
3
⁄
2 Ft.
1
4
Rect. to
6" round
transition
" x 10"
3
1
⁄
4 Ft.
4
Rect. to
6" round
transition
90° elbow
6" Round,
25 Ft.
90° elbow
6" Round,
16 Ft.
45° elbow
Subtotal column 1
MAXIMUM DUCT LENGTH: For satisfactory air
movement, the total duct length of a 3
rectangular, 7" diameter round duct should
not exceed 65 equivalent feet.
Installation Instructions
x USED
= TOTAL
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
x (
)
=
Ft.
=
Ft.
" x 10"
1
⁄
4
DUCT
PIECES
6" Round
wall cap
with
damper
6" Round
roof cap
6" Round
to
" x 10"
3
1
⁄
4
rect.
transition
6" Round
to
" x 10"
3
1
⁄
4
rect.
transition
90° elbow
7" Round,
90° elbow
7" Round,
45° elbow
7" Round
wall cap
with
damper
7" Round
roof cap
7" Round
to
" x 10"
3
1
⁄
4
rect.
transition
7" Round
to
" x 10"
3
1
⁄
4
rect.
transition,
90° elbow
7
EQUIVALENT
NUMBER
LENGTH
x USED
53 Ft.
x (
)
(39 ft. w/o
damper)
x (
)
72 Ft.
x (
)
3 Ft.
x (
)
9 Ft.
x (
)
14 Ft.
x (
)
9 Ft.
x (
)
28 Ft.
x (
)
(21 ft. w/o
damper)
x (
)
39 Ft.
x (
)
1 Ft.
x (
)
5 Ft.
x (
)
Subtotal column 2
Subtotal column 1
Total ductwork
= TOTAL
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
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