Patent ID: 6974381

Claim:
An air flow producer adapted for installation on a seating structure surrounding a rectangular opening in a drop ceiling, the air flow producer comprising: a housing with a vertical axis, a circular-cylindrical side wall centered about the axis, a closed top and an open bottom; a fan located in and supported from the housing, the fan comprising a rotary blade assembly rotating about the vertical axis and producing an air flow through the open bottom of the housing; an air flow grill overlaying the open bottom of the housing; a circular flow-separating cylindrical band supported from the housing proximate to the open bottom, the band centered about the vertical axis and extending around the blade assembly, the band defining an air discharge zone centered in the grill and an annular air intake zone radially outward of the discharge zone; and, means defining a flange with a generally rectangular periphery for supporting the housing from the seating structure, the flange extending horizontally outward relative to the side wall of the housing and conforming to the seating structure thereby to close the opening against flow of air.