Air barrier device using pressurized swirls

Abstract From the Canadian patent

An air barrier device using pressurized swirls for creating an air curtain barrier across a building opening such as a door or window, to reduce heat transfer and thereby reduce both winter and summer energy losses. The device comprises a housing with an air intake for mounting within the building above the opening to be protected a number, of air discharge ducts having internal means for whirling the air passing therethrough and arranged to discharge the air downwardly across the opening as a series of distinct adjacent oppo-, sitely rotating, pressurized swirls to form an air curtain barrier to energy transfer in either direction through the opening and, a blower mounted in the housing to …