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1. A packaged heating ventilating and cooling (HVAC) system comprising: a cabinet having a condenser compartment at a bottom portion, a return air compartment at a top portion, and a condenser discharge air compartment between the condenser compartment and the return air compartment; a fan panel proximate a bottom of the condenser discharge air compartment and a top of the condenser compartment; a shelf proximate a bottom of the return air compartment and a top of the condenser discharge air compartment, wherein the fan panel and the shelf partially define the condenser discharge air compartment; an outdoor air chase positioned within the cabinet and extending through the condenser discharge air compartment, the outdoor air chase having a top end and a bottom end, wherein the bottom end of the outdoor air chase is connected to the fan panel and fluidly coupled to the condenser compartment, the outdoor air chase configured to receive outside air by way of the condenser compartment, and wherein the top end of the outdoor air chase is connected to the shelf and fluidly coupled to the return air compartment, and wherein the outdoor air chase has a conduit through the outdoor air chase; a configurable flow regulating plate disposed in the outdoor air chase across the conduit; and wherein the configurable flow regulating plate comprises: a plate having a plurality of discharge apertures, wherein, in an initial position before installation, the plurality of discharge apertures is covered by a plurality of knockout panels, wherein each knockout panel of the plurality of knockout panels is removably secured to the configurable flow regulating plate, and wherein, in an installed position, the plurality of discharge apertures and plurality of knockout panels are sized such that removal of each knockout panel increases airflow of outdoor air through the outdoor air chase during normal operation.
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