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A ceiling vent assembly consisting of a pair of opposed end panels and a pair of opposed side panels which defining a frame. At least one louver is pivotally mounted within the frame to be movable between an open position to permit airflow through the vent assembly and a closed position blocking air

A ceiling vent assembly consisting of a pair of opposed end panels and a pair of opposed side panels which defining a frame. At least one louver is pivotally mounted within the frame to be movable between an open position to permit airflow through the vent assembly and a closed position blocking airflow. The louver includes an upper surface defining a curvature and decreases in thickness at an outer edge. When in an open configuration, the louver permits air to pass through the ceiling vent assembly in a directed flow associated with the curvature of the louver upper surface.

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1. A ceiling vent assembly comprising: a frame comprising a pair of opposed end panels and a pair of opposed side panels; said side and end panels each having an upper edge and a lower edge; said frame being open at a top and a bottom thereof;at least one louver mounted in said frame to pivot about

1. A ceiling vent assembly comprising: a frame comprising a pair of opposed end panels and a pair of opposed side panels; said side and end panels each having an upper edge and a lower edge; said frame being open at a top and a bottom thereof;at least one louver mounted in said frame to pivot about a pivot axis between an open position wherein air can flow through and exit said ceiling vent assembly and a closed position wherein the open bottom of said frame is substantially closed to substantially prevent air from flowing through and exiting said ceiling vent assembly; said louver having an inner edge, an outer edge, opposed end edges, an upper surface and a lower surface; said louver upper surface defining a continuous concave curve which extends substantially between the opposed end edges and substantially from said inner edge to said outer edge of the louver; said louver lower surface having a first major portion extending from the inner edge of said louver substantially toward the outer edge of the louver and a second edge portion which extends from the first portion to the outer edge of the louver; the first portion having a curvature substantially matching the curvature of the louver upper surface to define a major portion of the louver having a generally constant thickness; said second portion of said louver lower surface defining a sloped surface to such that said edge portion of said louver has a decreasing in thickness; andwherein said louver is mounted in said frame such that air exiting said ceiling vent assembly travels along said concave upper surface of said louver; said curvature of said louver upper surface being shaped and configured to direct air flow generally outwardly and horizontally along a ceiling in which said vent assembly is mounted and said airflow moving away from the ceiling vent assembly when said louver is disposed in an open position. 2. The ceiling vent assembly of claim 1 wherein said louver outer edge is rounded in cross-section. 3. The ceiling vent assembly of claim 1 wherein the lower edge of said side panels of said frame is curved in cross-section. 4. The ceiling vent assembly of claim 1 including an upwardly extending channel extending along an outer surface of said frame; said channel being positioned on said outer surface of said frame to be spaced below a lower surface of a ceiling when said ceiling vent assembly is mounted in a ceiling. 5. The ceiling vent assembly of claim 1 including a pulley assembly for operation of a single louver through which a rope is threaded; said rope being connected at one end to said louver, said rope passing through said frame, and said rope having a second end positioned to be accessible by an operator; whereby, said louver is moved to its closed position by pulling the rope and moved to its opened position under force of gravity by releasing the rope. 6. The ceiling vent assembly of claim 1 including a pulley assembly for operation of a single louver through which a rope is threaded; said rope being connected at one end to a ceiling surface adjacent to a side panel of said frame, said rope passing through a first pulley secured adjacent the outer edge of said louver and traversing below said lower surface of said louver to a second pulley secured to a longitudinal midline support member of said frame; and said rope having a second end positioned to be accessible by an operator; whereby tension in said rope between said connected end at said ceiling surface and said second pulley maintains said louver in said closed position; andwhereby, said louver is moved from said closed position to said open position under force of gravity by releasing tension in said rope. 7. A ceiling vent assembly comprising: a pair of opposed end panels and a pair of opposed side panels; said end panels and side panels defining a frame; said side and end panels each having an upper edge and a lower edge; said frame being open at a top and a bottom thereof;at least one louver pivotally mounted in said frame to be movable between an open position wherein air can flow through and exit said ceiling vent assembly and a closed position wherein the open bottom of said frame is substantially closed to substantially prevent air from flowing through and exiting said ceiling vent assembly; said louver having an inner edge, an outer edge, opposed end edges, an upper surface and a lower surface; said louver upper surface having a curvature defining a continuous convex curve extending substantially between the opposed end edges and substantially from said inner edge to said outer edge of the louver;said vent assembly including means for directing air exiting said vent assembly generally outwardly and horizontally along a ceiling in which said vent assembly is mounted and away from the ceiling vent assembly and means for minimizing turbulence of the air exiting the vent assembly; said means comprising said upper surface; said outer edge, and cross-sectional shape of an end portion of said louver; wherein said outer edge is radiused and said end portion extends from said outer edge toward said inner edge; said end portion increasing in thickness from said outer edge toward said inner edge to a maximum thickness; said end portion having a length substantially shorter than the inner edge-to-outer edge length of said louver. 8. The vent assembly of claim 7 wherein said air directing means further comprises the bottom edge of said side panels; said side panel bottom edge being curved in cross-section. 9. A ceiling vent assembly, comprising: a rectangular frame configured for attachment to a supporting ceiling structure, said frame including first and second transverse ends and first and second longitudinal sides; said frame being open at a top and a bottom thereof;a pair of louvers pivotally mounted between said first and second transverse ends, each louver of said pair of louvers defining an inner edge, an outer edge and opposed side edges; each louver of said pair of louvers being pivotable about a longitudinal axis which is proximate said inner edge of said louvers and is generally parallel to said longitudinal sides of the frame; the longitudinal axes of said louvers being positioned approximately mid-way along said transverse ends of said frame; each of said louvers being pivotable between a closed position in which an upper surface of said louvers abuts a bottom edge of said longitudinal sides of the frame to substantially prevent air from flowing through and exiting said ceiling vent assembly and an open position in which said upper surface of said louver is displaced from said bottom edge of said longitudinal side of the frame to allow air to exit said vent assembly through the bottom of said vent assembly; said upper surface of each of said louvers defining a continuous concave curve extending substantially from said inner edge to said outer edge of the louver and extending substantially between the opposed side edges of said louver; said outer edge of said louvers being rounded in cross-section; andwherein said rounded outer edges of said louvers and said concave curvature of said upper surfaces of said louvers cooperate to direct a flow of air entering said ceiling vent assembly from above said louvers generally outwardly and horizontally along a ceiling in which said vent assembly is mounted and away from the ceiling vent assembly when at least one of said louvers is in an open position. 10. The vent assembly of claim 9 wherein said bottom edge of each of said first and second longitudinal sides of said frame includes an outwardly-directed curved flange defining a rolled edge. 11. The vent assembly of claim 9 wherein said bottom edge of each of said first and second longitudinal sides includes an outwardly-directed flange defining a channel adjunct said bottom edge of each of said first and second longitudinal sides. 12. The vent assembly of claim 9 wherein each of said louvers includes a tapered end portion extending the width of said louver from one side edge to the other side edge; said tapered end portion extending from said outer edge toward said inner edge a determined length; said determined length of said tapered outer portion being substantially less than an overall length of said louver from said inner edge to said outer edge; said louvers being of substantially constant thickness from an inner end of said tapered portion to said inner edge of said louver; said tapered outer portion in part directing an airflow passing between said bottom edge of said longitudinal side and said louver generally outwardly and horizontally along the ceiling and away from the ceiling vent assembly when said louver is in an open configuration. 13. The vent assembly of claim 9 wherein each of said louvers is independently movable from said open position to said closed position. 14. The vent assembly of claim 9 further including a rope and pulley system for selectively opening or closing said louvers, said rope and pulley system including at least one pulley and at least one rope passing through said at least one pulley and having an end fixed to either one of said louvers or a support for said vent assembly, said at least one pulley being positioned and said rope being threaded such that the position of said louver is responsive to tension in said rope. 15. The vent assembly of claim 14 wherein a fixed end of said rope is secured to said louver such that tension on said rope moves said louver to said closed position; and whereby release of tension on said rope enables a force of gravity to move said louver to said open position. 16. The vent assembly of claim 14 wherein a fixed end of said rope is secured to a fixed structure adjacent to said louver and is passed through a first pulley disposed below said outer edge of said louver to a second pulley coupled to a fixed support adjacent said longitudinal midline of said frame, below said louver rotational axis, whereby tension on said rope moves said louver to said closed position; and whereby release of tension on said rope enables a force of gravity to move said louver to said open position, regulated by contact between said rope and a lower surface of said louver. 17. A ceiling vent assembly for regulating airflow entering a structure, comprising: a frame structure adapted for fitted attachment within an opening of the structure; said frame being open at a top and bottom thereof;at least one louver disposed within said frame structure and having an upper surface, a lower surface, an inner edge, an outer edge and opposed side edges, said louver adapted for pivotal movement about a longitudinal axis of rotation which is adjacent an inner longitudinal edge of the louver, said pivotal movement altering a position of said louver from a closed configuration wherein an outer longitudinal edge is in abutting contact with a bottom edge of said frame structure to substantially prevent air from exiting said ceiling vent assembly to an open configuration providing an airflow gap between an upper surface of said louver and said bottom edge of said frame; andwherein said louver upper surface and lower surface define a thickness of said louver; said louver defining a first portion of generally constant thickness extending from said inner edge toward said outer edge and an end portion extending from said first portion to said outer edge of said louver; the bottom surface in said end portion sloping upwardly toward said upper surface, such that said end portion is a portion of decreasing thickness; said upper surface defining a concave surface extending substantially between the opposed side edges of said louver and substantially from the inner edge to the outer edge of said louver; whereby, the tapered end portion directs airflow exiting the vent assembly generally outwardly and horizontally along the ceiling and away from the ceiling vent assembly when said louver is in said open configuration. 18. The ceiling vent assembly of claim 17 wherein said frame comprises a pair opposed end members and a pair of opposed side members; said ceiling vent assembly further including a second louver disposed within said frame structure, said second louver being a mirror-image of said first louver to direct, when in an open configuration, a portion of the airflow entering the structure through said ceiling vent assembly generally along said ceiling in a direction which is opposite from the portion of the directed airflow passing through said first louver opening; wherein said louvers pivot between said opened and closed configurations about pivot axes which are substantially parallel to each other, adjacent each other, and extend between the opposed side members of said frame approximately midway between said end members of said frame. 19. The ceiling vent assembly of claim 18 wherein said first and second louvers are independently adjustable between said open and closed configurations.