FIELD: applying of coat to constructional or process parts. SUBSTANCE: spraying chamber has cleaning device 4 connected with vacuumizer to provide for suction of powder material, which is separated from wall by cleaning device 4. Carrier 41 has at least one carrier plate 410. Cleaning members 42 having scraping edges 421 directed to wall are positioned on edge 411 of carrier 41 or carrier plate 410. Cleaning members 42 may be formed as scraping strips 421 made from resilient material. Chamber is provided with filter-chuck extractor 21. Spraying chamber has device 423 for removing contaminants from cleaning members 42 or scraping strips 421 by providing series of pressure pulses. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 34 cl, 22 dwg
