Simply put, every square inch of a cleanroom should be absolutely pristine. Ceiling panels, lighting units, HEPA filtration units, sprinkler heads, walls, glass surfaces, process equipment, piping systems, floors, and manufacturing equipment should all be decontaminated regularly. Even the ambient air must be monitored and maintained at proper levels. HEPA-filtered ventilation systems assisted by preventative measures help manufacturers limit airborne contamination. However, in order to assure environmental purity, regular housecleaning procedures are necessary.