FIELD: fire prevention. SUBSTANCE: method involves feeding fire-extinguishing substance into cavity and simultaneously reducing entrance of air by using energy of fire-extinguishing substance. Entrance of air is restricted by increasing aerodynamic resistance of through part of housing due to power action of fire-extinguishing substance flow upon air flow. Apparatus has power station , positioned in through part of housing cavity, fire-extinguishing substance source with nozzle (nozzles), actuating unit. Nozzles are positioned tangentially, transverse or in countercurrency to approach stream so that streams run from nozzles to form gas curtain. EFFECT: increased efficiency and simplified method. 12 cl, 5 dwg
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