Fume hoods, Hygiene, Cleanroom technology, Capturing of pollutants, Air-borne pollutants, Cleanroom zone, GMP guidelines, Plant engineering, Protection factor, Cleanroom systems, Protection of person, Protection of product, Protection of room, Protection of vicinity, WIBO, Hazardous substance, Contamination, Workplace, Safety, Filter, Cleanroom quality, Cleaning of exhaust air, Extraction