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Nothing is more important than air flow for the proper operation of a clothes dryer. A dryer is
a pump which draws make-up air from the out-of-doors, through the heater, through the
clothes and then forces the air through the exhaust duct back to the out-of-doors. Just as in a
fluid water pump, there must be a fluid air flow to the inlet of the dryer, if there is to be the
proper fluid air flow out of the exhaust duct.
In summary, there must be the proper size out-of-doors inlet air opening (4-6 times the
combined areas of the air outlet) and an exhaust duct, size and length of which allows flow
through the dryer with no more than 0.3 inches water column (.8 mbar) static pressure in the
exhaust duct.
In some instances, special fans are required to supply make-up air, and/or boost exhaust fans
are required for both regular and energy saving models.
FOR BEST DRYING:
1. Exhaust duct maximum length 14 feet (5 m) of straight duct and maximum of two
90° bends.
2. Use 45° and 30° elbows wherever possible.
3. Exhaust each dryer separately.
4. Do not install wire mesh or other restrictions in the exhaust duct.
5. Use clean-outs in the exhaust duct and clean periodically when needed.
6. Never exceed 0.3 inches water column (.8 mbar) static pressure in the exhaust
duct without a booster fan.
7. Inside surface of the duct must be smooth.
8. Recommend pop rivets for duct assembly.
FOR BEST DRYING:
1. Provide opening to the out-of-doors in accordance with the following:
For each dryer—
8 inches (204 mm) diameter exhaust requires 2 square feet (.1858 m²) make-up air.
12 inches (305 mm)diameter exhaust requires 4 square feet (.3716 m²) make-up
air.
2. Use barometric shutters in the inlet air opening to control air when dryers are not
running.
Other Recommendations
To assure compliance, consult local building code requirements.
Troubleshooting
Hot dryer surfaces, scorched clothes, slow drying, lint accumulations, or air switch
malfunction are indicators of exhaust duct and/or make-up air problems.
DRYER AIR FLOW INSTALLATION
DRYER AIR FLOW
INSTALLATION
EXHAUST
DUCT
MAKE-UP AIR
OTHER RECOMMENDATIONS
TROUBLESHOOTING