GE JN327 Owner's Manual And Installation Instructions page 7

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, 12 Ft.
90° elbow
6" Round, 7 Ft.
45° elbow
Subtotal column 1
MAXIMUM DUCT LENGTH: For satisfactory air
movement, the total duct length of a 3
rectangular, 6" or 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
24 Ft. x ( )
(18 ft. w/o
damper) x ( )
33 Ft. x ( )
2 Ft. x ( )
4 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.