Patent ID: 6974383

Claim:
A cabinet for air handling equipment, comprising: an enclosure defining an interior and an exterior; a blower in fluid communication with the interior of the enclosure to create a pressure differential between the interior and the exterior; a right jamb connected to the enclosure; a left jamb connected to the enclosure; a threshold extending between the right jamb and the left jamb; a lintel above the threshold and extending between the right jamb and the left jamb, whereby the right jamb, the left jamb, the threshold, and the lintel define an access opening into the enclosure; a door for selectively covering the access opening, a hinge that pivotally connects the door to one of the right jamb and the left jamb; a latch attached to the door, wherein the latch includes an inner surface and an outer surface facing in generally opposite directions; and a strike attached to at least one of the right jamb, the left jamb, the lintel and the threshold, wherein the latch is selectively movable between a disengaged position spaced apart from the strike and two engaged positions engaging the strike, wherein the two engaged positions include a positive pressure position and a negative pressure position, wherein the outer surface engages the strike and the inner surface disengages the strike when the latch is in the positive pressure position, and the inner surface engages the strike and the outer surface disengages the strike when the latch is in the negative pressure position.