Choose a route that will provide the straightest and most direct path outdoors. Plan the installation to use the fewest number of elbows and turns.
When using elbows (rigid duct) or making turns (thick wall flexible metal duct), allow as much room as possible. With thick wall flexible metal duct bend duct gradually to avoid kinking and avoid 90˚ turns.
recommended | acceptable |
Maximum length of exhaust duct
The maximum length of the exhaust duct system depends upon:
The type of ducts (rigid or thick walled flexible metal).
The number of elbows or bends used.
1.Refer to the exhaust duct length chart that matches your hood type for the maximum duct lengths you can use. Do not use duct runs longer than specified in the exhaust duct length charts (refer to next page).
Exhaust duct systems longer than specified will:
Accumulate lint creating a potential fire hazard.
Shorten the life of the dryer.
Reduce performance, resulting in longer drying times and an increased energy usage.
2.Determine the number of elbows/bends you will need.
3.In the column listing the type of metal duct you are using (rigid or thick wall flexible metal), find the maximum length of metal duct on the same line as the number of elbows/bends to be used (refer to next page).
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