Patent ID: 7981175

Claim:
A self-cleaning blow-off for a rotary air screen, comprising: a blow-off channel including an inlet disposed for receiving a flow of air from an air source, and a movable blow-off channel section mountable externally to the air screen and disposed adjacent to a bottom portion of the air screen, the movable blow-off section includes an upwardly open U-shaped channel extending along substantially the length of the bottom portion of the air screen, wherein the movable blow-off section has a discharge outlet at a distal end thereof, the moveable blow-off section configured and supported to be movable between an operational position disposed adjacent to the bottom portion of the air screen for directing the flow of air across the bottom portion of the air screen for blowing debris and dirt from the screen and directing the debris and dirt along the channel to be discharged through the discharge outlet, and a cleaning position disposed away from the screen such that accumulated debris and dirt in the blow-off section will be released, and an actuator connected to and controllably operable for moving the movable blow-off section between the operating position and the cleaning position.