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Exhaust Hood Type
90° Turns
4" 2-1/2"
Maximumlength of 4-inch diameter
rigid metal duct
0 65 ft. 59 ft.
1 54 ft. 48 ft.
2 44 ft. 38 ft,
3 36 ft. 30 ft.
4 28 ft. 22 ft.
Maximumlength of 4-inch diameter
flexible stiff wailed metal duct
0 36 ft. 28 ft.
1 32 ft. 24 ft.
2 28 ft. 20 ft.
3 25 ft. 17 ft.
4 23ft. 15ft.
For difficult installationsrequiring a flexible transition, multi-layeredthin foil exhaust duct may be used.
Thinfoil duct:
• must be the type that is approved for dryer installations by ULor other comparabletesting agency.
• must conform to all applicable codes.
• must only be used as a transition between the dryer and the wall connection.
• must not exceed8 feet in length when stretched.
• must not interconnectwith other thin foil flexible ducts.
• must be extended to the full length with any excess removed.
• must be installed only by a qualified and trained installer,
• must not be placed near sharp objects.
• must be kept as straight as possible.
• must not be used inside the dryer.
• must be inspected regularlyto be sure that it has not become crushed or otherwise restricted.
Thin foil duct will reduce airflow resultingin longer drying times. To reduce the negative effect on drying
performancethe thin foil ducting:
• should be shaped such that there are no more than two 90-degree elbows in the foil duct.
• should not be used in conjunction with rigid duct runs that are longer than 20 feet.
• shouldnot be usedin duct runs that includemorethan three 90-degreeelbows.
• should be supportedto minimize sagging.
Serious blockagecan result in flexible metal duct if bent too sharp. Never install anytype of ducting in walls,
ceilings,or other concealedspaces.
Keep exhaustduct as straight and short as possible. Exhaust systems longer than recommendedcan extend
drying times, affect machine operationand may collect lint. Securejoints with duct tape.
Do not use screws.
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