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WORKSHEET—CALCULATE TOTAL EQUIVALENT
DUCTWORK LENGTH
Duct Pieces
3 1/4" x 10"
Rect., straight
7" Round,
straight
6" Round,
straight
3 1/4" x 10"
Rect. 90°
elbow
3 1/4" x 10"
Rect. 45°
elbow
3 1/4" x 10"
Rect. 90° flat
elbow
3 1/4" x 10"
Rect. wall cap
with damper
3 1/4" x 10"
Rect. to
6" round
transition
3 1/4" x 10"
Rect. to
6" round
transition 90°
elbow
6" Round,
90° elbow
6" Round,
45° elbow
Column 1
Equivalent
Number
X
Length
used
1 Ft.
x (
)
1 Ft.
x (
)
1 Ft.
x (
)
14 Ft.
x (
)
8 Ft.
x (
)
33 Ft.
x (
)
24 Ft.
x (
)
(18 ft.
w/o
damper)
x (
)
2 Ft.
x (
)
4 Ft.
x (
)
25 Ft.
x (
)
16 Ft.
x (
)
Subtotal column 1 =
=
Total
=
Ft.
Ft.
=
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
=
Ft.
11
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