No waste pipe from a refrigerator or icebox floor drain or any other receptacle where food is stored shall connect directly with any house drain, soil or waste pipe. Such waste pipes shall in all cases empty into an open sink that is properly supplied with water, connected, trapped and vented the same as other fixtures. They may also discharge into a downspout or rain leader trap located inside the building or into a cellar floor drain, but their ends must be left open. Such waste connections shall not be located in inaccessible or unventilated cellars.
Refrigerator waste pipes shall be not less than 1 1/4 inches for one opening, 1 1/2 inches for three openings and not less than two inches for four to 12 openings. They shall have at each opening a trap and cleanout at angles, so arranged as properly to flush and clean the pipe. Such waste pipes shall be continued not less than full size through the roof, except where such fixtures are located in the basement or first floor.
Pipes from a water supply tank or exhaust from a water lift cleaner or pressing machines or other exhaust pipes shall not be directly connected with any house drain, soil or waste pipe. Such pipes shall discharge upon the roof or be trapped into an open fixture or discharge as for refrigerator wastes.