Wastes from the following shall not discharge directly into any building drain, soil or waste pipes: a refrigerator, icebox, soda fountain, bar waste, fish or meat counters or other receptacle, appliance, device or apparatus which is used for storage, preparation or processing of food or drink and which is not water-connected; an appliance, device or apparatus using water as a cooling or heating medium; a water still; a swimming pool; a water treatment device or a water-operated device.
Drinking fountains may be installed with indirect wastes or shall be connected directly into a drainage system trapped and vented same as other fixtures. Such pipe shall have a minimum diameter of 1 1/4 inches.
Indirect waste pipes shall discharge into a water-supplied, trapped and vented open sink or other approved receptacle which shall be located in an accessible, ventilated place. The air gap shall be equal to or greater than the nominal diameter of the waste pipe.
Water lifts, expansion tanks, cooling jackets, sprinkler systems, drips or overflow pans, or similar devices which waste clear water only, may discharge onto a roof, into a sump or so as to drain into a trapped fixture.
No toxic, corrosive, inflammable, explosive or other liquid, vapor, gas or substance of any kind harmful to the drainage system shall be discharged into such drain or sewer unless subjected to treatment approved by the administrative authority.
Appliances, devices or apparatus not regularly classed as plumbing fixtures, but which have drips or drainage outlets, shall be drained by special waste pipes discharging into an open fixture or other approved receptacle.