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• Exhaust systems longer than recommended can extend drying times, affect machine operation
and may collect lint.
• The exhaust duct should end with an exhaust hood with a swing out damper to prevent back
drafts and entry of wildlife. Never use an exhaust hood with a magnetic damper.
• The hood should have at least 12 inches (30.5 cm) of clearance between the bottom of the
hood and the ground or other obstruction. The hood opening should point down.
Never install a screen over the exhaust outlet.
• When possible, do not exhaust the dryer directly into a window well in order to avoid lint build-
up. Do not exhaust under a house or porch.
• If exhaust ductwork must run through an unheated area, the duct should be insulated and slope
slightly down towards the exhaust hood to reduce condensation and lint build-up.
• Inspect and clean the interior or the exhaust system at least once a year. Disconnect electrical
service prior to cleaning.
• Frequently check to be sure the exhaust hood damper opens and closes freely.
If new dryer is installed into an existing exhaust system you must be sure:
• The exhaust system meets all local, state and national codes.
• That plastic flexible duct is not used.
• Inspect and clean all lint accumulation from the interior of the existing duct.
• The duct is not kinked or crushed.
• The exhaust hood damper opens and closes freely.
The static pressure in any exhaust system must not exceed 0.83
inches of water column, or be less than 0.
This can be measured with the dryer running with a manometer at the point where
the exhaust duct connects to the dryer. A no heat setting should be used.
The dryer tumbler should be empty and the lint filter clean.
10.1 m (33 ft.)
8.8 m (29 ft.)
7.6 m (25 ft.)
6.5 m (21 ft.)
24.4 m (80 ft.)
20.7 m (68 ft.)
17.4 m (57 ft.)
14.3m (47 ft.)
0
1
2
3
22.6 m (74 ft.)
18.9 m (62 ft.)
15.5 m (51 ft.)
12.5 m (41 ft.)
12.4 m (41 ft.)
11.2 m (37 ft.)
10.1 m (33 ft.)
9.0 m (29 ft.)
ELECTRIC AND GAS DRYER
Weather Hood Type
Recommended
Metallic Flexible*
Metallic Flexible*
Rigid
Rigid
* Do not use non metallic flexible duct.
No. of 90°
elbows
4”(10,16 cm)
Use only for short run installation
2 1/2”(6,35 cm)
NED7200TW-02033C 2007.9.6 10:22 AM Page 5