Importance

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Abstract

An air curtain doorway defining an opening between at least two zones, including an air curtain having an air supply duct and an air return duct joined by a connecting duct. A frame having spaced apart jambs connected at the top by a header is configured to fit substantially within the opening of the air curtain. At least two roll-up doors in communication with the frame are configured to selectively insulate the at least first and second zones. A method of controlling a plurality of roll-up doors of an air curtain doorway comprises the steps of monitoring the output of at least a first sensor and a second sensor to sense approach of the doorway, applying logic to the output of the sensors, and controlling at least one of the doors based upon the result of the applied logic. The method can also include closing the roll-up doors while the air curtain is blowing, or turning off the air curtain and closing the roll-up doors.

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First Claim