Heating, ventilating, and air conditioning and purification equipment (ambient); air treatment equipment; flues and installations for conveying exhaust gases; air filters for industrial installations; water filters; industrial treatment apparatus and installations; regulating and safety accessories for water and gas installations; fume destructing hoods; extractor fans for exhaust gas and fans for gas extractors; fans for fume extractors; ventilating fans; ventilating fans; gas cleaners and p...