Standard Fittings - Amana MVH340E Manuel De L'utilisateur

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.
For 3 1/4"x10" SYSTEMS
3 1/4"x10"
90˚ elbow
1-3 1/4" x 10" 90˚ elbow
1-Wall Cap
8 feet straight duct
TOTAL LENGTH
INSTALLATION
1
3 1/4"x10"
to 6"=5ft.
4 5
3 1/4"x10"
wall cap
90˚ elbow
=40ft.
=10ft.
6ft.
wall cap
2ft.
=
=
=
=
2 3
3 1/4"x10" roof
cap=24ft.
6
45˚ elbow
=5ft.
Figure 9
Examples
90˚ elbows
transition
1-transition
25 ft.
2-90˚ elbows
40 ft.
1-Wall Cap
8 ft.
8 feet straight
73 ft.
TOTAL LENGTH
-38 -
3 1/4"x10" 90˚
elbow=25ft.
7
3 1/4"x10"
flat elbow
=10ft.
For 6" ROUND SYSTEMS
6ft.
2ft.
wall cap
= 5 ft.
= 20 ft.
= 40 ft.
= 8 ft.
= 73 ft.