A wave solder machine configured to perform a wave solder operation on an electronic substrate, the wave solder machine comprising: a fluxing station configured to apply flux onto the electronic substrate; a pre-heating station configured to heat the electronic substrate; a wave soldering station configured to attach electronic components to the electronic substrate with solder; a conveyor configured to transport substrates through a tunnel passing through the fluxing station, the pre-heating station and the wave soldering station; characterized by a flux management system configured to remove contaminants from the tunnel, the flux management system being in fluid communication with the tunnel for passage of a vapor stream from the tunnel through the flux management system and back to the tunnel, wherein the flux management system comprises a housing, a first stage unit provided within the housing, and a second stage unit provided within the housing and in fluid communication with the first stage unit, wherein the first stage unit includes an air-to-air heat exchanger using compressed air as a cooling medium to condense flux vapor on contact with the air-to-air heat exchanger, the first stage unit separating larger particles from a gas stream, wherein the air-to-air heat exchanger includes a plurality of tubes configured to receive compressed air, wherein the air-to-air heat exchanger includes at least one airflow deflector plate (78, 80) in thermal contact with the plurality of tubes, wherein the at least one airflow deflector plate (78, 80) includes a plurality of slots formed therein through which a plurality of tubes of the heat exchanger extend when assembled. a fluxing station configured to apply flux onto the electronic substrate; a pre-heating station configured to heat the electronic substrate; a wave soldering station configured to attach electronic components to the electronic substrate with solder; a conveyor configured to transport substrates through a tunnel passing through the fluxing station, the pre-heating station and the wave soldering station; characterized by a flux management system configured to remove contaminants from the tunnel, the flux management system being in fluid communication with the tunnel for passage of a vapor stream from the tunnel through the flux management system and back to the tunnel, wherein the flux management system comprises a housing, a first stage unit provided within the housing, and a second stage unit provided within the housing and in fluid communication with the first stage unit, wherein the first stage unit includes an air-to-air heat exchanger using compressed air as a cooling medium to condense flux vapor on contact with the air-to-air heat exchanger, the first stage unit separating larger particles from a gas stream, wherein the air-to-air heat exchanger includes a plurality of tubes configured to receive compressed air, wherein the air-to-air heat exchanger includes at least one airflow deflector plate (78, 80) in thermal contact with the plurality of tubes, wherein the at least one airflow deflector plate (78, 80) includes a plurality of slots formed therein through which a plurality of tubes of the heat exchanger extend when assembled.