LG Electronics 3828W5U0492 Standard Fittings, Duct Length, Examples, For 3 1/4x10 SYSTEMS, 73 ft

Standard Fittings

NOTE: If the existing duct is round, you must use a rectangular-to-round adapter, with a rectangular 3" extension duct installed between the damper assembly and the adapter to prevent the exhaust damper’s sticking.

Duct Length

The total length of the duct system, including straight duct, elbows, transitions, and wall or roof caps must not exceed the equivalent of 140 feet.

For best performance, do not use more than three 90 degree elbows, and keep length as short as possible.

Below are the standard fittings and their equivalent length in feet.

1

3 1/4” x 10” to 6"=5ft.

2

3 1/4” x 10” roof cap=24ft.

3

3 1/4” x 10” 90˚ elbow=25ft.

4

90˚elbow

=10ft.

5

3 1/4” x 10” wall cap =40ft.

6

45˚elbow

=5ft.

7

3 1/4” x 10” flat elbow =10ft.

Figure 10

To calculate the equivalent length of each duct piece used, see the examples below.

Examples

For 3 1/4"x10" SYSTEMS

For 6"ROUND SYSTEMS

6ft.	wall cap
2ft.

6ft.

transition 2ft.

wall cap

1-3 1/4” x 10” 90° elbow	=	25 ft.
1-Wall Cap	=	40 ft.
8 feet straight duct	=	8 ft.
TOTAL LENGTH	=	73 ft.

1-transition	=	5 ft.
2-90° elbows	=	20 ft.
1-Wall Cap	=	40 ft.
8 feet straight	=	8 ft.
TOTAL LENGTH	=	73 ft.

– 9 –