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WORKSHEET—CALCULATE TOTAL EQUIVALENT DUCTWORK LENGTH
DUCT
EQUIVALENT NUMBER
PIECES
LENGTH
3
⁄
" x 10"
1 Ft.
1
4
Rect.,
straight
7" Round,
1 Ft.
straight
6" Round,
1 Ft.
straight
3
⁄
" x 10"
14 Ft.
1
4
Rect. 90°
elbow
3
⁄
" x 10"
8 Ft.
1
4
Rect. 45°
elbow
3
⁄
" x 10"
33 Ft.
1
4
Rect. 90°
flat elbow
3
⁄
" x 10"
24 Ft.
1
4
Rect.
(18 ft. w/o
wall cap
damper)
with
damper
3
⁄
" x 10"
2 Ft.
1
4
Rect. to
6" round
transition
3
⁄
" x 10"
4 Ft.
1
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
round duct should not exceed 65 equivalent feet.
Installation Instructions
x USED
= TOTAL
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
=
⁄
" x 10" rectangular, 7" diameter
1
4
DUCT
PIECES
Ft.
6" Round 53 Ft.
wall cap
with
damper
Ft.
6" Round 72 Ft.
roof cap
Ft.
6" Round 3 Ft.
to
Ft.
3
⁄
" x 10"
1
4
rect.
transition
Ft.
6" Round 9 Ft.
to
3
⁄
" x 10"
1
4
rect.
Ft.
transition
90° elbow
7" Round, 14 Ft.
Ft.
90° elbow
Ft.
7" Round, 9 Ft.
45° elbow
7" Round 28 Ft.
Ft.
wall cap
with
damper
7" Round 39 Ft.
Ft.
roof cap
7" Round 1 Ft.
to
3
⁄
" x 10"
1
4
rect.
Ft.
transition
7" Round 5 Ft.
to
Ft.
3
⁄
" x 10"
1
4
rect.
transition,
Ft.
90° elbow
8
EQUIVALENT
NUMBER
LENGTH
x USED
x (
)
(39 ft. w/o
damper)
x (
)
x (
)
x (
)
x (
)
x (
)
x (
)
x (
)
(21 ft. w/o
damper)
x (
)
x (
)
x (
)
x (
)
Subtotal column 2
Subtotal column 1
Total ductwork
1 ft = 0.3 m; 1 in. = 2.5 cm
= TOTAL
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
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