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Backflow. an air gap between the water supply inlet and the flood level rim of the plumbing fixture / equipment / or nonfood equipment not at least twice the diameter of the water supply inlet and may not be less than 25 mm (1 inch). a backflow or backsiphonage prevention device installed on a water supply system shall meet american society of sanitary engineering (asse) standards for construction, installation, maintenance, inspection, and testing for that specific application and type of device. a backflow prevention device shall be located so that it can be serviced and maintained. a hose shall not be attached to a faucet unless a backflow prevention device is installed.

Openings. outside openings not protected against the entrance of insects by filling or closing holes and other gaps along floors / walls / ceilings / tight-fitting, self-closing doors, kept closed / closed windows / screening / properly designed and installed air curtains to control flying insects / other means.

Attachments. light fixtures / vent covers / wall-mounted fans / similar equipment not including decorative items attached to walls and ceilings not easily cleanable / not maintained in good repair / not kept clean.