Patent ID: 9017156
Filing Date: 2015-04-28
Classification: F24F

Abstract:
1. A mechanically-modulated ventilation unit apparatus comprising: a high-velocity blower having an intake, an exhaust, an impeller disposed to ventilate air from the intake to the exhaust, and an electric motor operatively connected to drive the impeller; an air control module having a casing enclosing a flow passage that defines a flow axis extending from an inlet flange of the casing to an outlet flange of the casing, a blade pivotally mounted within the casing and movable between a plurality of positions each obstructing a different portion of the flow passage, and an actuator operatively connecting the blade to the casing for moving the blade to one of the plurality of positions in response to a command signal received at the actuator; said air control module and said blower being arranged such that said blower ventilates the flow passage of said air control module; wherein electric power consumption by the electric motor of said high-velocity blower is modulated solely by movement of the blade within said air control module; wherein the broadest surface of the blade of said air control module has a generally rectangular shape with rounded corners and has a height and width that substantially corresponds to a height and width of the flow passage; and wherein the blade obstructs about 84% of the flow passage when the blade is positioned perpendicular to the flow passage of the casing, the rounded corners of the blade permitting the flow passage to remain about 16% unobstructed when the blade is positioned perpendicular to the flow passage of the casing.