§ 23.115. Ventilation.
(a) A mechanical system of ventilation shall be installed in drycleaning areas and provided with means for remote control. Mechanical systems of ventilation shall have sufficient capacity to insure complete and continuous change of air in drycleaning rooms once every 3 minutes. The ventilation system shall operate automatically when any drycleaning equipment is in use. The ventilation system shall be automatically shut off upon operation of the fire protection or detection systems.
(b) Drying tumblers and drying cabinets shall be ventilated to the outside air by means of properly constructed pipes or ducts connected to an exhaust fan of sufficient capacity to remove all dust, vapors or lint generated by the process. The fan shall be properly housed and so interlocked as to insure operation while the drying tumbler is in use. The fan spiders, blades or running rings shall be constructed of nonferrous metal. In no case shall the fan motor be mounted within the ventilating duct.
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