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Commercial dishwashing sinks, pot washing sinks, pre-rinse sinks, silverware sinks, bar sinks, soda fountain sinks, and other similar fixtures shall be indirectly connected except when located adjacent to a floor drain, whereby the waste may be connected directly on the sewer side of the floor drain trap, and the fixture shall be trapped and vented as required by this chapter; provided, however, that no other drainage line be permitted between the floor drain waste connection and the fixture drain. All indirectly connected sinks shall be provided with a vented trap located as close as possible to the sink and in the same room. The piping from the equipment to the air gap shall not exceed 5 feet (1,525 mm) and shall be of material as required by this chapter. The air gap shall be a minimum of 1 inch (25 mm).