a source capture system for capturing contaminated air from an industrial process includes structure both for continuously capturing a contaminated air volume emitted during operation of the industrial process and for mixing that contaminated air volume with an ambient air volume to produce a mixed air volume which is then transferred to an air clean apparatus or the like . the source capture system recognizes that air volumes will exhibit different characteristics traveling through an air treatment system , and that certain of those characteristics such as cloud - like formation and contaminated air volumes having significant gaseous phase vapor components are undesirable and operate to decrease the overall effectiveness of the air treatment system , regardless of what type of technology is used for the air cleaning apparatus . accordingly , the source capture system is designed in such a way as to reduce the occurrence of cloud - like formations and increase the condensation of mist / vapor components of the air volume presented to air cleaning apparatus .