The invention applies to the renewable energy sector, in particular to the flue gas treatment from heat production boilers at singlefamily apartaments. The invention is characterized with the fog zone and the direct drop contact zone organization simultaneously. In turn the settling tank makes it possible to recycle injected water in fog unit. Invention in flue gas treatment equipment provides particulate emission treatment efficiency increase from domestic solid fuel boilers. Also invention provides heat recovery by flue gas cooling, icreasing the boiler’s energy effeciency.