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13 <br /> Exception: A permit is not required for private industry with trained maintenance <br /> personnel, private fire brigade or fire departments to maintain, test and use private <br /> hydrants. <br /> 105.6.38 Pyrotechnic Special Effects Material (Mandatory Permit) <br /> An operational permit is required for use and handling of pyrotechnic special <br /> effects material. <br /> 105.6.39 Pyroxylin Plastics (Optional Permit) <br /> An operational permit is required for storage or handling of more than 25 pounds (11 <br /> kg) of cellulose nitrate (pyroxylin) plastics, and for the assembly or manufacture of <br /> articles involving pyroxylin plastics. <br /> 105.6.40 Refrigeration Equipment (Optional Permit) <br /> An operational permit is required to operate a mechanical refrigeration unit <br /> or system regulated by Chapter 6. <br /> 105.6.41 Repair Garages (Optional Permit) <br /> An operational permit is required for operation of repair garages. <br /> 105.6.42 Rooftop Heliports (Optional Permit) <br /> An operational permit is required for the operation of a rooftop heliport. <br /> 105.6.43 Spraying or Dipping (Mandatory Permit) <br /> An operational permit is required to conduct a spraying or dipping operation utilizing <br /> flammable or combustible liquids, or the application of combustible powders <br /> regulated by Chapter 24. <br /> 105.6.44 Storage of Scrap Tires and Tire Byproducts (Optional Permit) <br /> An operational permit is required to establish, conduct or maintain storage of scrap <br /> tires and tire byproducts that exceeds 2,500 cubic feet (71 m3) of total volume of scrap <br />