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The article describes the air purifying device of the "OTPO-9" type, which implements the technology of hydrodynamic purification with a foam method where foam was produced by bubbling. The article considers it as the most environmentally efficient and energy-saving device, based on the results of implementation of the methodology of technology selection for purifying exhaust and effluent gases from toxic components of industrial, public and domestic power units up to 1000 kW developed by thedoi:10.1051/matecconf/201822604015 fatcat:sxcjhljlyrcl3mjvzsotbjy2de