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Dishwashing machines 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 waste or soil drainage line be permitted between the floor drain waste connection and the fixture drain. All indirectly connected dishwashing machine wastes shall be provided with a vented trap located as close as possible to the dishwashing machine and in the same room. The air gap shall not be less than 1 inch (25 mm).