(a) Every refrigerated warehouse and/or locker plant, including equipment, shall be kept in a clean, wholesome, and sanitary condition; and all food stored therein must be securely protected from dust, dirt, flies, insects, rodents and from contamination of every kind.

(b) Suitable toilet facilities, conveniently located, shall be provided. They shall be air conditioned or otherwise ventilated to the outer air, well lighted, kept clean and sanitary. Adequate handwashing facilities, in or nearby, shall be provided at all times with soap, running hot and cold water, mechanical hand dryer or single service towels. Toilets shall not open directly into any room where food is handled, packed or stored. Openings to the outer air shall be screened with 12-gauge or smaller mesh screen or by other acceptable modern device. Notices shall be posted conspicuously in toilets, at washrooms and throughout the plant directing all employees to the importance of washing their hands before commencing work and after visiting toilet rooms.

(c) No operator or lessee shall require or permit any person to work, nor shall any person work in a refrigerated warehouse or locker plant who is known to be affected with an infectious or contagious disease.