DOUBLE AIR SCREEN Russian patent published in 1998 - IPC

FIELD: protection of working areas against penetration of cold air through transport openings. SUBSTANCE: double air screen includes air lock, air risers in air lock opening and in gate of building, fan with heater of inner screen and fan of outer screen. Air to risers of outer screen is fed by means of fan of general exhaust ventilation system form working area. Risers are located at air lock inlet. Air lock may be stationary of mobile. It is provided with double elastic walls. In this case, motion of outer risers is effected over guides, for example over rails as double elastic walls get filled with air. EFFECT: enhanced reliability and efficiency; facilitated mounting; reduction of power requirement for heating the production areas. 2 cl, 1 dwg