LG SHD3689BD - Page 10

-10-
PLANNING THE INSTALLATION
Duct pieces
Equivalent
number
length x used =
Total
3- 1/ 4” x 10”
Rect.,
straight
1 Ft. x ( ) = Ft..
6”, 7”, 8”, 10”
Round,
straight
1 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 90º
elbow
15 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 45º
elbow
9 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect. 90º
flat elbow
24 Ft. x ( ) = Ft.
7” to 6” or
8” to 7” Round
tapered
reducer
25 Ft. x ( ) = Ft.
6”, 7“, 8”
Round in-line
damper
15 Ft. x ( ) = Ft.
6”, 7”, 8”, 10”
Round,
90
º
elbow
15 Ft. x ( ) = Ft.
6”, 7”, 8”, 10”
Round,
45º elbow
9 Ft. x ( ) = Ft.
Ft.
Maximum Duct Length: For satisfactory air
movement, the total duct length sho uld not e x ceed
100 equivalent feet.
Duct pieces
Equivalent
number
length x used =
Total
3- 1/ 4” x 10”
Rect. to
6” round
transition
5 Ft. x ( ) = Ft..
3- 1/ 4” x 10”
Rect. to
6” round
transition 90
°
elbow
20 Ft. x ( ) = Ft.
6” round to
3- 1/ 4” x 10”
rect.
transition
1 Ft. x ( ) = Ft.
6” round to
3- 1/ 4” x 10”
rect.
transition 90
°
elbow
16 Ft. x ( ) = Ft.
7” round to
3 1/ 4” x 10”
rect.
transition
8 Ft. x ( ) = Ft.
7” round to 3-
1/ 4” x 10”
rect.
transition
900 elbow
23 Ft. x ( ) = Ft.
3- 1/ 4” x 10”
Rect.
wall cap
with damper
30 Ft. x ( ) = Ft.
6”, 7”, 8”, 10”
Round, wall
cap with
damper
30 Ft. x ( ) = Ft.
6”, 7”, 8”, 10”
Round
roof cap
30 Ft. x ( ) = Ft.
Subtotal column 2 =
Ft..
Subtotal column 1 =
Ft.
Total ductwork =
Ft.