Air handling unit and method for controlling a flow of air therethrough

1. An air handling unit, comprising:

a manifold having an inlet configured to receive a supply of air from a blower;

a plurality of induction apertures formed in said manifold, said induction apertures enabling a passage of air from said manifold out of said air handling unit and entering into a space below, and being configured to induce a flow of air from said space below said air handling unit into said air handling unit;

a bypass plenum formed in said manifold and configured to selectively direct additional air from said manifold to said space below said air handling unit without passing through said induction apertures; so that the total amount of the air exiting said air handling unit can be variable;

a damper positioned within said bypass plenum, said damper being pivotable between a closed position and an open position to allow said air from said manifold to exit said air handling unit and enter said space below through said bypass plenum when a pressure within said manifold exceeds a threshold pressure; and

an actuator operatively connected to said damper, said actuator being adjustable to set said threshold pressure.

2. The air handling unit of claim 1 , wherein:

said actuator includes an axle connected to said damper, a pin mounted to a distal end of said axle opposite said damper and extending generally transverse to said axle, and a weight slidably received on said pin.

3. The air handling unit of claim 2 , wherein:

said weight is selectively movable along said pin between a first position in which said weight is adjacent to said axle, and a second position in which said weight is spaced from said axle, to adjust said threshold pressure.

4. The air handling unit of claim 3 , wherein:

said actuator includes a structure configured to fix said weight in position on said pin.