14 English
Ins
tallation
Installation
Ducting requirements
Weather hood type
Recommended
Use only for short-run installation
4” (10.2 cm)
2.5” (6.4 cm)
No. of 90°
elbows
Rigid
Metallic
flexible*
Rigid
Metallic
flexible*
0
80 ft. (24.4 m)
41 ft. (12.4 m)
74 ft. (22.6 m)
33 ft. (10.1 m)
1
68 ft. (20.7 m)
37 ft. (11.2 m)
62 ft. (18.9 m)
29 ft. (8.8 m)
2
57 ft. (17.4 m)
33 ft. (10.1 m)
51 ft. (15.5 m)
25 ft. (7.6 m)
3
47 ft. (14.3 m)
29 ft. (8.8 m)
41 ft. (12.5 m)
21 ft. (6.5 m)
NOTE
* Do not use non-metallic flexible duct.
•
Use a 4-inch (10.2 cm) diameter rigid aluminum or rigid galvanized steel duct.
•
Do not use a smaller duct.
•
Ducts larger than 4 inches (10.2 cm) in diameter can cause increased lint accumulation.
Lint accumulation should be cleaned regularly.
•
If a flexible metal duct must be used, use the type with a stiff sheet metal wall. Do not
use a flexible duct with a thin foil wall. Serious blockage can result if the flexible metal
duct is bent too sharply.
•
Never install any type of flexible duct in walls, ceilings, or other concealed spaces.
•
Keep the exhaust duct as straight and short as possible.
•
Secure joints with duct tape. Do not use screws.
•
Plastic flexible duct can kink, sag, be punctured, reduce airflow, extend drying times, and
affect dryer operation.
•
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 the entry of wildlife. Never use an exhaust hood with a magnetic damper.
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