Amana MVH250L Standard Fittings, Exam les, 1-31/4 x 10 90 elbowD, 25if.E, WallCapD, 40 ft.D

Installation

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 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.

1D2D3[3

3 1/4"xlO"[J	3 1/4"x10" roofD	3 1/4"x10" 90"0
to 6"=5ft.	cap=24ft,	elbow=25ff,

6n

	3 1/4"x10"D		3 1/4"x10"D
90" elbowO	wall capri	45" elbowE]	flat elbow n
=10ft.	--40ft.	=5ft.	=10II.

Figure 9

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

Exam )les

For 3 1/4"x10"	SYSTEMS				For 6" ROUND SYSTEMS
31/4"xW 'n _	6ft. _	wall cap		90"elbows _
90" elbow I_-'-'_-'-		I
				transi_		6ft. ,--.-_t//wall	cap
Hi"
1-3 1/4" x 10" 90° elbowD		=	25if.E]	1-transitionE]		=	5 ft.E
				2-90 ° elbowsD		=	20 ft.r
1-Wall CapD		=	40 ft.D
				1-Wall	CapD	=	40 ft.E
8 feet straight ductD		=	8 ft.D
				8 feet	straight []	=	8 ft.r
TOTAL LENGTH		=	73 ft.D
				TOTAL LENGTH		=	73 ft.E
		D
						D

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