CLASS IV PLANTS—ADDITIONAL REQUIREMENTS
§ 23.131. Equipment.
(a) Fans. The fans required by this subchapter for every drycleaning, dyeing, tumbler or drying room shall be of sufficient size or number to prevent concentrations of fumes above 50 parts per million of atmosphere for carbon tetrachloride systems or 200 parts per million of atmosphere for perchlorethylene and similar types of systems.
(b) Electrical. Lighting shall be by electricity. All electrical equipment, devices, and wiring shall be in rigid conduit installed in accordance with the requirements of Chapter 39 (relating to safety standards—general).
(c) Automatic indraft. Class IV systems shall have an automatic indraft of air with sufficient negative pressure to overcome the effects of the overhead exhaust fan. It is recommended that this indraft of air go on automatically at any time the loading door is open, whether or not the portion of the cycle is such that the door is open or closed. As a substitute for the automatic operation of the indraft at times other than the prescribed door-opening times, a visual and audible alarm may be used to indicate that the machine is not being operated properly.
(d) Safety valve. On machines utilizing steam pressure, an approved type safety valve shall be installed on the low pressure side of the steam-reducing valve. In no case may the valve be adjusted for a pressure higher than the design pressure of the equipment.
(e) Machine exposure. Where members of the public are customarily admitted to the vicinity of the drycleaning machine, only the front or customer side of the drycleaning machine shall be exposed in the customer area. The working or maintenance portion of the equipment shall be separated from the front of the machine by a solid partition.
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