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8
DUCT EQUIVALENT NUMBER
PIECES LENGTHxUSED = TOTAL
3
1
⁄
4
”x 10” 1 Ft.x( )= Ft.
Rect.,
straight
7” Round, 1 Ft.x( )= Ft.
straight
6” Round, 1 Ft.x( )= Ft.
straight
3
1
⁄
4
”x 10” 14 Ft.x( )= Ft.
Rect. 90°
elbow
3
1
⁄
4
”x 10” 8 Ft.x( )= Ft.
Rect. 45°
elbow
3
1
⁄
4
”x 10” 33 Ft.x( )= Ft.
Rect. 90°
flat elbow
3
1
⁄
4
”x 10” 24 Ft.x( )= Ft.
Rect.
(18 ft. w/o
wall cap
damper)
x( )= Ft.
with
damper
3
1
⁄
4
”x 10” 2 Ft.x( )= Ft.
Rect. to
6” round
transition
3
1
⁄
4
”x 10” 4 Ft.x( )= Ft.
Rect.to
6” round
transition
90° elbow
6” Round, 25 Ft.x( )= Ft.
90° elbow
6” Round, 16 Ft.x( )= Ft.
45° elbow
Subtotal column 1=Ft.
WORKSHEET—CALCULATE TOTAL EQUIVALENT DUCTWORK LENGTH
DUCT EQUIVALENT NUMBER
PIECES LENGTH xUSED=TOTAL
6” Round 53 Ft.x( )= Ft.
wall cap
(39 ft. w/o
with
damper)
x( )= Ft.
damper
6” Round 72 Ft.x( )= Ft.
roof cap
6” Round 3 Ft.x( )= Ft.
to
3
1
⁄
4
”x 10”
rect.
transition
6” Round 9 Ft.x( )= Ft.
to
3
1
⁄
4
”x 10”
rect.
transition
90° elbow
7” Round, 14 Ft.x( )= Ft.
90° elbow
7” Round, 9 Ft.x( )= Ft.
45° elbow
7” Round 28 Ft.x( )= Ft.
wall cap(
21 ft. w/o
with
damper)
x( )= Ft.
damper
7” Round 39 Ft.x( )= Ft.
roof cap
7” Round 1 Ft.x( )= Ft.
to
3
1
⁄
4
”x 10”
rect.
transition
7” Round 5 Ft.x( )= Ft.
to
3
1
⁄
4
”x 10”
rect.
transition,
90° elbow
Subtotal column 2= Ft.
Subtotal column 1= Ft.
Total ductwork= Ft.
Installation Instructions
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.
1 ft = 0.3 m; 1 in. = 2.5 cm
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