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 in thermal contact with the plurality of tubes, wherein the at least one airflow deflector plate 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 in thermal contact with the plurality of tubes, wherein the at least one airflow deflector plate includes a plurality of slots formed therein through which a plurality of tubes of the heat exchanger extend when assembled. <EOS>