FULL FOOD CODE:
(A) PHYSICAL FACILITIES shall be cleaned as often as necessary to keep them clean. (B) Except spill cleanup, cleaning shall be done during periods when the least amount of FOOD is exposed such as after closing.

FULL FOOD CODE:
(A) Intake and exhaust air ducts shall be cleaned and filters changed so they are not a source of contamination by dust, dirt, and other materials. (B) If vented to the outside, ventilation systems may not create a public health HAZARD or nuisance or unLAWful discharge.