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4"
Determining vent length
INSTALLATION INSTRUCTIONS
No. of
90°
turns
Rigid Metal Vent 4 in dia
Maximum length
0 36 ft 36 ft 26 ft
1 26 ft 26 ft 16 ft
2 16 ft 16 ft 6 ft
EXHAUST HOOD TYPE
4"
2
1
⁄2"
Flexible Metal Vent
4 in dia
Maximum length
0 28 ft 28 ft 22 ft
1 18 ft 18 ft 12 ft
2 8 ft 8 ft 2 ft
NOTE: Check periodically to ensure that
the outside exhaust hood is not blocked.
The maximum length of the exhaust system
depends upon:
• The type of vent (rigid or flexible metal).
• The number of elbows (90° turns) used.
To determine maximum vent length:
1. See the Exhaust Hood Type chart that
matches your type hood for the maximum
vent lengths you can use.
Do not use vent runs longer than
specified in Exhaust Hood Type chart.
Exhaust systems longer than specified will:
• Shorten the life of the dryer.
• Reduce performance, resulting in
longer drying times and increased
energy usage.
2. Determine the number of elbows you will
need.
3. In the column listing the type of metal vent
you are using (rigid or flexible), find the
maximum length of metal vent on the
same line as the number of elbows.
10
Exhaust hood
Flexible metal vent or
rigid metal vent
Elbow
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