Amana ACO1860AS Owner's Manual download pdf (Page 13)

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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.

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

Figure 9

4567

3 1/4"x10"

to 6"=5ft.

90˚ elbow

=10ft.

45˚ elbow

=5ft.

3 1/4"x10"

wall cap

=40ft.

3 1/4"x10"

flat elbow

=10ft.

3 1/4"x10" roof

cap=24ft.

3 1/4"x10" 90˚

elbow=25ft.

Examples

For 3 1/4"x10" SYSTEMS

1-3 1/4" x 10" 90˚ elbow

1-Wall Cap

8 feet straight duct

TOTAL LENGTH

1-transition

2-90˚ elbows

1-Wall Cap

8 feet straight

TOTAL LENGTH

For 6" ROUND SYSTEMS

6ft.

2ft.

3 1/4"x10"

90˚ elbow

wall cap

6ft.

90˚ elbows

transition

wall cap

= 25 ft.

= 40 ft.

= 8 ft.

= 73 ft.

= 5 ft.

= 20 ft.

= 40 ft.

= 8 ft.

= 73 ft.

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Amana ACO1860AS Owner's Manual Page 13

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