FIELD: suction apparatuses for exhaust boxes, furnaces and other equipment. SUBSTANCE: apparatus includes several fan impellers and electric motor. Each impeller is housed in spiral casing being part of housing of the apparatus. Housing has two envelope halves (upper and lower). Each envelope has two or more halves of spiral casings and semitips restricting exhaust holes. Electric motor is arranged in cylindrical case provided with levers mutually spaced by 120 degrees. Levers have on their ends pins with vertical axles and enlarged bases. Halves of spiral casings are mounted mutually in parallel. There are intervals between adjacent halves of spiral casings. Connection cross pieces having central bushings with vertical axles are arranged in said intervals. Axles provide exact joining by means of pins and mutual combining of envelope halves at upper and lower sides relative to fan-motor unit. EFFECT: simplified assembling and automatic centering of fan-motor unit wholly arranged in housing. 2 cl, 14 dwg
