FIELD: fire-fighting equipment. SUBSTANCE: device has a body, two turning fire-retardent plates secured inside body on axles, on opposite sides from actuating mechanism in the form of electric motor, means for fixing of plates in closed position and means for holding of plates in open position made in the form of springs. Fire-retardent plates are secured inside body on axles on opposite sides from actuating mechanism symmetrically and at an angle relative to longitudinal axis of air duct. One of fire-retardent plates is driven and hinged by means of connecting bar to driving fire-retardent plate. Spring ends are rigidly connected to middle of connecting bar and to body. EFFECT: simplified design. 2 dwg
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