Patent ID: 7037189
Filing Date: 2006-05-02
Classification: F24F

Abstract:
1. An air shutter to be installed in an opening of a doorway where a temperature difference exists between the inside and outside thereof in order to intercept an air stream through the opening of the doorway, wherein a single vertical air curtain plane is sectionalized into an upper zone and a lower zone defined by distinct airstreams, the upper zone being a warm air interception airstream zone and the lower zone being a cold air interception airstream zone, wherein the upper warm air interception airstream zone and the lower cold air interception airstream zone are separated from each other to leave an intermediate region between said upper zone and said lower zone, and wherein an upper first opening for emitting warm air interception air and a lower second opening for emitting cold air interception air are provided on respectively opposite sides of the air shutter adjacent the sides of the doorway opening to form a single air shutter in which the direction of the airstream flowing generally horizontally in the upper warm air interception airstream zone above said intermediate region is opposite the direction of the airstream flowing generally horizontally in the lower cold air interception airstream zone below said intermediate region.