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12
Duct Pieces
MAXIMUM DUCT LENGTH: For satisfactory air movement, the total
duct length of a 3 1/4" x 10" rectangular, 7" diameter round duct
should not exceed 65 equivalent feet.
Column 2
Equivalent
Length
6" Round wall
1 Ft.
cap with
damper
6" Round
1 Ft.
roof cap
6" Round to
1 Ft.
3 1/4" x 10"
rect. transition
6" Round to
1 Ft.
3 1/4" x 10"
rect. transition
90° elbow
7" Round,
1 Ft.
90° elbow
7" Round,
1 Ft.
45° elbow
7" Round,
1 Ft.
wall cap with
damper
7" Round,
1 Ft.
roof cap
7" Round to
1 Ft.
3 1/4" x 10"
rect. transition
1 Ft.
7" Round to
3 1/4" x 10"
rect. transition
90° elbow
Subtotal column 2 =
Subtotal column 1 =
Total ductwork =
Number
X
=
used
Total
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
x (
)
=
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
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