LG Electronics LMV1630BB, LMV1630WW Standard Fittings, Duct Length, Prepare The Venting System

STEP 2: Prepare The Venting System

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 140 feet.

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

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

1

3 1/4” x 10” to 6" = 5 ft.

2

3 1/4” x 10” roof cap = 24 ft

3

3 1/4” x 10” 90˚ elbow = 25 ft

4

90˚elbow

= 10 ft

5

3 1/4” x 10” wall cap = 40 ft

6

45˚elbow

= 5 ft

7

3 1/4” x 10” flat elbow = 10 ft

Figure 10

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

Examples

	For 3 1/4" x 10" SYSTEMS						For 6" ROUND SYSTEMS			wall cap
			6ft.		wall cap				6ft.
						transition		2ft.
		2ft.
						1 transition			=	5 ft.
1 3 1/4” x 10” 90° elbow				=	25 ft.	2 90° elbows			=	20 ft.
1 Wall Cap				=	40 ft.	1 Wall Cap			=	40 ft.
8 feet straight duct				=	8 ft.	8 feet straight			=	8 ft.
TOTAL LENGTH				=	73 ft.	TOTAL LENGTH			=	73 ft.

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