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C. FRESH AIR SUPPLY
When the dryer is operating, it draws in room air, heats it, passes this air through the tumbler (basket), and
exhausts it out of the building. Therefore, the room air must be continually replenished from the outdoors. If the
make-up air is inadequate, drying time and drying efficiency
will be adversely affected. Ignition problems and sail
switch "fluttering" problems may result, as well as premature motor failure from overheating.
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An
unrestricted source of air is necessary for each dryer. An airflow of 5,300 cfm (cubic feet per minute) - 150 cmm
(cubic meters per minute) - must be supplied to each gas dryer and 6,500 cfm (cubic feet per minute) - 184 cmm
- must be supplied to each steam dryer. As a general rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum of 5 square feet (0.46 square meters) for each gas dryer and a minimum of 6 square
feet (0.56 square meters) is required for a steam dryer.
To compensate for the use of registers or louvers used over the openings, this make-up air area must be
increased by approximately thirty-three percent (33%). Make-up air openings should not be located in an area
directly near where exhaust vents exit the building.
It is not necessary to have separate make-up air openings for each dryer. Common make-up air is distributed
equally to ALL dryers. However, they must be set up in such a manner that the make-up air is distributed
equally to ALL the dryers.
IMPORTANT: Make-up air openings should not be located near duct work exhaust outlets.
If the make-up air openings is too close to the exhaust outlet, lint and fumes may be
drawn into the dryer area through these openings.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitudes or predominantly low pressure areas.
IMPORTANT: Make-up air must be provided from a source free of dry cleaning fumes. Make-
up air that is contaminated by dry cleaning solvent fumes will result in irreparable
damage to motors and other components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.