PURPOSE:To prevent contaminant from dispersing and to efficiently collect dust by combining a dust collecting unit and a fan unit with a distance between and sending a spot flow having an inductive action from the fan unit to the suction opening of the dust collecting unit. CONSTITUTION:The dust collecting unit 1 is installed to the ceiling part just above or nearly above the contaminant generating source, and the fan unit 2 is installed confronting the dust collecting unit. When both fans 7, 11 are put into operation, the polluted air is sent into the dust collecting unit 1 without dispersion by the inductive action of the spot air flow flowing from an air flow guide nozzle 12 of the fan unit 2 to the suction opening 4 of the dust collecting unit 1 with the result that the polluted air is instantly cleaned. Moreover, by forming a light transmitting line between both units, a synchronized operation is surely carried out, and by integrating the fan unit 2 with a table 13 or a cigarette butt stand a preferable installation is realized.
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