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Indirect sanitary wastes shall be installed as follows: Waste piping from filters, refrigerators, ice boxes, steam tables, egg boilers, coffee makers, bottleholders, ice cube containers, or any equipment or other receptacle where food or drink is stored shall discharge to the drainage piping system through an air gap into a waste receptor. The minimum size shall be 1 inch (25 mm) and the maximum length of the indirect waste shall not exceed 15 feet (4.57 m) and shall be provided with cleanouts at every 90 degree turn and shall be accessibly located. Indirect wastes shall be piped to the waste receptor with material that is required by this chapter. Waste receptors serving indirect pipes connected to equipment shall not be installed in any toilet room, closet, store room or any inaccessible space. Each waste receptor shall be trapped and vented as required by this chapter. The air gap shall not be less than 1 inch.