Page 22
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 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
booster exhaust fans are required.
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 (.8 mbar) water column static pressure in the
exhaust duct.
7.
Inside surface of the duct must be smooth.
8.
Recommend pop rivets for duct assembly.
FOR BEST DRYING:
1.
Make-up air from outside the building may enter the enclosure from
the top or side walls. The area of the opening must be a minimum of
210 square inches (135484 mm²) for each dryer. This will deliver the
proper amount of make-up air at an air velocity of approximately
500 fpm (152 m/min) through the opening.
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.
Exhaust and Venting
DRYER AIR FLOW
INSTALLATION
EXHAUST DUCT
MAKE-UP AIR
OTHER
RECOMMENDATIONS
TROUBLESHOOTING
