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• Do not exceed the length of duct pipe for the number of elbows shown in the
chart below. Doing so can cause an accumulation of lint, increase drying time,
and create a nj re hazard.
• Two 45° elbows equal one 90° elbow.
Recommended Maximum Exhaust Length
Exhaust Hood Types
Recommended Use Only For Short Run
Installations
4"
(10.2 cm)
dia.
4"
(10.2 cm)
4"
(10.2 cm)
dia.
2½"
(6.4 cm)
4"
(10.2 cm)
dia.
No. of 90° Elbows Rigid Metal Rigid Metal
0
1
2
3
90 feet
60 feet
45 feet
35 feet
60 feet
45 feet
35 feet
25 feet
• All joints should be tight to avoid air leaks. The male end of each section of
ducting must point away from the dryer.
• Use clamps or duct tape to connect and seal all joints.
Do not connect with screws or other fasteners that
extend into the interior of the duct as they will create a
collection point for lint.
Clamp
• Avoid running the exhaust system through an unheated area as this will
cause condensation to form inside the duct and accelerate the rate of lint
accumulation.
• Avoid running the exhaust system vertically through a roof as this may expose
the exhaust system to down drafts, causing an increase in air restriction.
• Avoid sagging, compression or crimping of the exhaust system as this will result
in reduced airǍ ow and poor dryer performance.
• Do not screen the end of the exhaust system. Lint will accumulate and
eventually clog the screen. Use an approved exhaust hood to terminate the duct
outdoors.