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If floor drains are installed in coolers, freezers, refrigerated holding areas, dressing rooms or processing rooms in any food (meat, milk, vegetable, fruit) establishment, they shall meet the following requirements:
1. Floor drains shall have a minimum inside diameter of 4 inches (102 mm) and be of metallic construction.
2. Drainage lines from water closets and urinals shall not be connected with any other sanitary drainage lines having floor drains located in the above places within the building.
3. Floor drains must be indirectly discharged to the drainage system, or a backwater valve that conforms with the requirements of Article 18-29-8.