FIELD: electric engineering. SUBSTANCE: any air consumer is connected to air duct through the branch provided with a shutter according to random law. Position of each shutter is fixed by end switches and control parameter of electric drive control unit is formed according to positions of the end switches. Total current is used as control parameter; the current passes through additional resistors. Resistors are switched into control circuit by means of end switches. Current passing through each resistor is formed proportionally to discharge through corresponding branches provided with shutters. Capacity of ventilation set is changed proportional to the total current by means of changing number of revolutions of electric engine. EFFECT: improved efficiency. 1 dwg
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