Standard Fittings - Amana MVH250E Manuel De L'utilisateur

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