GE 164D4290P393 - Manual (Page 8)

DUCT EQUIVALENT NUMBER
PIECES LENGTH x USED = 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″ 8.5 Ft. x ( ) = Ft.
Rect. 90°
elbow
3 1 ⁄
4
″x 10″
7 Ft. x ( ) = Ft.
Rect. 45°
elbow
3 1 ⁄
4
″x 10″
24 Ft. x ( ) = Ft.
Rect. 90°
flat elbow
3 1 ⁄
4
″x 10″ 45 Ft. x ( ) = Ft.
Rect. (7 ft. w/o
wall cap damper) x ( ) = Ft.
with
damper
3 1 ⁄
4
″x 10″ 4.5 Ft. x ( ) = Ft.
Rect. to
6
″ round
transition
3 1 ⁄
4
″x 10″ 11.5 Ft. x ( ) = Ft.
Rect. to
6
″ round
transition
90° elbow
6
″ Round,
8 Ft. x ( ) = Ft.
90° elbow
6
″ Round,
6.5 Ft. x ( ) = Ft.
45° elbow
Subtotal column 1 = Ft.
8
WORKSHEET—CALCULATE TOTAL EQUIVALENT DUCTWORK LENGTH
DUCT EQUIVALENT NUMBER
PIECES LENGTH x USED = TOTAL
6 ″Round 34 Ft. x ( ) = Ft.
wall cap (6 ft. w/o
with damper) x ( ) = Ft.
damper
6 ″ Round 30 Ft. x ( ) = Ft.
roof cap
6
″ Round 5.5 Ft.
x ( ) = Ft.
to
3
1 ⁄
4
″x 10″
rect.
transition
6
″ Round 14.5 Ft.
x ( ) = Ft.
to
3
1 ⁄
4
″x 10″
rect.
transition
90° elbow
7
″ Round, 8 Ft.
x ( ) = Ft.
90° elbow
7
″ Round, 6.5 Ft.
x ( ) = Ft.
45° elbow
7
″ Round 34 Ft.
x ( ) = Ft.
wall cap (6 ft. w/o
with damper) x ( ) = Ft.
damper
7 ″ Round 30 Ft. x ( ) = Ft.
roof cap
7
″ Round 5.5 Ft.
x ( ) = Ft.
to
3
1 ⁄
4
″x 10″
rect.
transition
7
″ Round
14.5 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, 6
″ or 7″ diameter round duct should
not exceed 65 equivalent feet.