Section 27-782
§ 27-782 General requirements. All systems shall be maintained in a
clean and orderly condition, free from accumulations of dust, oily
waste, or debris. All machinery and all operating devices on piping and
ductwork shall be kept readily accessible for inspections and repair.
Plenum chambers, air ducts, and cooling and heating coils shall be kept
clean. Filters shall be cleaned or renewed at proper intervals to insure
safe operation and adequate air flow and shall comply with the
applicable requirements of the fire prevention code.