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20
4"
Determining vent length
No. of
90°
turns
Heavy Metal Vent 4-inch diameter
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-inch diameter
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 (heavy 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 hood type 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 (heavy or flexible), find the
maximum length of metal vent on the
same line as the number of elbows.
Exhaust hood
Flexible metal vent or
heavy metal vent
Elbow
INSTALLATION INSTRUCTIONS
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