GE 164D4290P393 Owner's Manual And Installation Instructions page 8

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 1 ⁄ 8.5 Ft.
4
Rect. 90°
elbow
" x 10"
3 1 ⁄ 7 Ft.
4
Rect. 45°
elbow
" x 10"
3 1 ⁄ 24 Ft.
4
Rect. 90°
flat elbow
" x 10"
3 1 ⁄ 45 Ft.
4
Rect. (7 ft. w/o
wall cap damper)
with
damper
" x 10"
3 1 ⁄ 4.5 Ft.
4
Rect. to
6" round
transition
" x 10"
3 1 ⁄ 11.5 Ft.
4
Rect. to
6" round
transition
90° elbow
6" Round, 8 Ft.
90° elbow
6" Round, 6.5 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 EQUIVALENT
PIECES LENGTH
6" Round 34 Ft.
wall cap (6 ft. w/o
with damper)
damper
6" Round 30 Ft.
roof cap
6" Round 5.5 Ft.
to
" x 10"
3 ⁄
1
4
rect.
transition
6" Round 14.5 Ft.
to
" x 10"
3 1 ⁄
4
rect.
transition
90° elbow
7" Round, 8 Ft.
90° elbow
7" Round, 6.5 Ft.
45° elbow
7" Round 34 Ft.
wall cap (6 ft. w/o
with damper)
damper
7" Round 30 Ft.
roof cap
7" Round 5.5 Ft.
to
" x 10"
3 1 ⁄
4
rect.
transition
7" Round 14.5 Ft.
to
" x 10"
3 1 ⁄
4
rect.
transition,
90° elbow
8
NUMBER
x USED = TOTAL
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
x ( ) =
Subtotal column 2 =
Subtotal column 1 =
Total ductwork =
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.
Ft.