American Dryer Corp. ADS-464 II - Manual (Page 29)

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F. FRESH AIR SUPPLY REQUIREMENTS
When the dryer is operating, it draws in room air, heats 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 make-up air is
inadequate, drying time and efficiency will be adversely affected, and safety will be compromised. Premature
component failure may result.
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 13,000 cfm (cubic feet per minute) - 368
cmm - must be supplied to each dryer. As a general rule, an unrestricted air entrance from the outdoors
(atmosphere) of a minimum 20-square feet (1.86 square meters) is required for each dryer.
To compensate for the use of registers or louvres used over the openings, the 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.
Allowances must be made for remote or constricting passageways or where dryers are located at excessive
altitude or predominantly low pressure areas.
IMPORTANT: Make-up air must be provided from a source free of dry cleaning solvent fumes.
Make-up air that is contaminated by dry cleaning solvent fumes will result in irreparable
damage to the motors and other dryer components.
NOTE: Component failure due to dry cleaning solvent fumes will VOID THE WARRANTY.