Patent ID: 6583726
Filing Date: 2003-06-24
Classification: F24F,Y02B

Abstract:
A device for detecting and preventing chemical or biological agents from contaminating a building air circulation system, comprising:a. an intake duct, having a first end which takes in ambient air, and a second end which discharges said air into said air circulation system; b. a first damper, attached to said first end of said intake duct, and movable between an open position wherein said air flows freely through said first damper, and a closed position wherein said first end of said intake duct is hermetically sealed; c. a second damper, attached to said second end of said intake duct, and movable between an open position wherein said air flows freely through said second damper, and a closed position wherein said second end of said intake duct is hermetically sealed; d. sensing means, capable of sensing the presence of said chemical or biological agents within said intake ducts; and e. control means, for closing said first and second dampers when said sensing means detects the presence of said chemical or biological agents, so as to hermetically seal said intake duct.