C. DRYER ENCLOSURE REQUIREMENTS
Bulkheads and partitions should be made of noncombustible materials and must be located a minimum of 12-inches (30.48 cm) - (18-inches [45.72 cm] or more is recommended for ease of installation, maintenance, and service) - above the dryer’s outer top, except along the front of the dryer which may be closed in if desired.
NOTE: Even though a minimum of 12-inches (30.48 cm) above the dryer’s outer top is acceptable, a clearance of 18-inches (45.72 cm) - (or more) - is suggested for ease of installation and service (electrical power connections).
NOTE: When fire sprinkler systems are located above the dryers, a minimum of 12-inches (30.48 cm) above the dryer’s outer top is required.
NOTE: Allowances must be made for opening the control door.
Dryers may be positioned sidewall to sidewall. However, allowances must be made for opening and closing of the control door and the lint door. It is suggested that the dryer be positioned about 2 feet (0.61 meters) away from the nearest obstruction for ease of installation, maintenance, and service (to be measured from the back guard.) Refer to the previous illustration on page 9 for details.
NOTE: Air considerations are important for proper and efficient operation.
D. FRESH AIR SUPPLY
Air supply (make-up air) must be given careful consideration to assure proper performance of each dryer. An unrestricted source of 840 cfm (cubic feet per minute) - 23.78 cmm (cubic meters per minute) - is necessary for each dryer. An unrestricted air entrance from the outdoors (atmosphere) of a minimum of 1-1/2 square feet (0.13 square meters) is required for each dryer. This area must be enlarged if louvers or registers cover the opening. It is not necessary to have a separate make-up air opening for each dryer. Common make-up air openings are acceptable. However, they must be set up in such a manner that the make-up air is distributed equally to the dryers. For example, for a bank of eight (8) dryers, a total make-up air opening of 12 square feet (1.11 square meters) is required. Two (2) openings measuring 2 feet by 3 feet (0.61 meters by 0.91 meters) - 6 square feet (0.55 square meters) - are acceptable. (Refer to the illustration on page 11.)
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 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.
