FIELD: applying of coat to products. SUBSTANCE: apparatus has closing device which may completely overlap gap between nozzles and edges of opening of filter section, when nozzle is positioned against opening. Closing device may completely overlap additional opening of at least one filter section adjacent to section opposed to nozzle. Edges of filter section opening adjacent to space communicated with suction device are positioned in common plane. Closing device of filter cleaning unit has flat surface faced to filter and defining edge of nozzle outlet. Closing device may be moved so that flat surface is positioned in plane of filter opening edges. Filter cleaning unit has member for pressing flat surface to edges of filter section openings. Chamber has bottom filter, which is at least partially inclined to horizontal plane. Bottom filter has filtering portions inclined relative to central axis to form construction similar to roof slopes. Chamber is provided with extraction channel system. Second extraction boxes are positioned adjacent to chamber bottom and two vertical wall joints. Bottom filter has at least one powder catching trough. One or several filters are made U-shaped with practically flat base surface and two inclined side walls extending from chamber edges into chamber cavity. Filter may be made wavy or corrugated or may have V-shaped surface. Cleaning device may be mounted in chamber for displacement within it and may be provided with second built-in extraction system. Cleaning device and delivery nozzle are moved in synchronism over filter surfaces to be cleaned. Cleaning device has two spaced cleaning members, with space between cleaning members being equal to width of one cellular section of filter. Some walls adapted to separate cellular sections are made from filtering material. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 16 cl, 9 dwg
