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Heating, ventilating, and air conditioning and purification equipment (ambient); Air treatment equipment; Flues and installations for conveying exhaust gases; Industrial filters; Industrial treatment installations; Regulating and safety accessories for water and gas installations; Fume destructing hoods; Extractor fans and Fans for gas extractors; Fans for fume extractors; Ventilating fans; Ventilating fans; Gas cleaners and purifiers; Flue gas cleaning apparatus; Gas cleaners and purifiers; Filters for cleaning gases [parts of industrial installations]; Hoods incorporating extractor fans; Filters for air extractor hoods; Fume destructing hoods; Air handlers; Air handling installations; Accelerated ion devices [for treating the air]; Ionization apparatus for the treatment of air or water; Ionisation apparatus for the treatment of air or water; Installations and equipment for exhaust gas treatment; Wet scrubbers; Separators for scrubbing gas; Electrostatic precipitators for cleaning gases; Gas scrubbers [parts of gas installations]; Air purifiers; Industrial air purifiers; Air sterilizers; Air filtering installations; Filters for air purifiers; Exhaust gas treatment systems