Improved heat exchanger having an inlet distributor and outlet collector

An improved heat exchanger assembly having an inlet header in hydraulic communication with an outlet header via a plurality of multi-channel flat refrigerant tubes, in which the multi-channel flat refrigerant tubes are substantially perpendicular to the headers. Interconnecting the refrigerant tubes are corrugated fins. The plurality of refrigerant tubes together with the fins defines the core of the heat exchanger assembly. The heat exchanger assembly also includes a distributor tube disposed in the inlet header cavity and a collector tube disposed in the outlet header cavity. The distributor tube and collector tube have cooperating features for archiving uniform refrigerant distribution through the refrigerant tubes.