Patent ID: 7800902

Claim:
An enclosure for regulating temperature of electronic modules positioned within the enclosure, comprising: a chassis having at least one airflow inlet and at least one airflow outlet; an air mover positioned within the chassis and creating airflow from said at least one airflow inlet to said at least one airflow outlet during operation of the air mover; and an air backflow prevention member positioned within the chassis between the airflow inlet and the air mover, fluidly coupled to the air mover and positioned to receive airflow from the at least one airflow inlet, the backflow prevention member including a frame assembly having a plurality of vanes and a plurality of stops for the plurality of vanes, the plurality of vanes rotatable between an open position during operation of the air mover due to the airflow created by the air mover, wherein the plurality of vanes are oriented oblique to a direction of airflow and in contact with the plurality of stops, and a closed position, wherein the plurality of vanes are oriented perpendicular to the direction when the air mover is not in operation due to pressure in the chassis.