Aspects of the present disclosure relate generally to noise suppression vertical curtain apparatus for heat exchanger units. In one implementation, a heat exchanger unit includes a frame having a plurality of side regions and at least one cooler associated with at least one of the plurality of side regions. The heat exchanger unit also includes a vertical axis, an internal volume, a floor, and a fan disposed above the floor to move air through the internal volume. The heat exchanger unit also includes a first set of panels disposed between the floor and the fan, and a vertical curtain disposed between the first set of panels and the fan.