clean the air and provide cleaned air at tangential fan 40 for redirection into duct 38 in base 22 and to exhaust 42 air treatment modules 75 include grease filter 76 a particulate filter 76 b and a deoderizing charcoal filter 76 c for cleaning the polluted air and capturing contaminants grease filter 76 a is an aluminum filter with change of direction flow to absorb heat and cool the air and to remove grease particulates removable grease collector 78 allows for collection and removal of accumulated grease other kinds of air treatment modules can also be included for the extraction or treatment of grease particulates steam and for treatment of odor and heat in the air passing down through riser duct 82 towards fan 40 for example an electrostatic precipitator and a catalytic converter can be included they can be installed as a part of grease filter 76 a in addition to grease filter 76 a or in the place of grease filter 76 a grease filter 76 a is available from component hardware group lakewood n j particulate filter 76 b and deoderizing charcoal filter 76 c are available from air filters inc houston tex combination filters that includes a grease filter and a catalytic converter are available from applied catalysts doraville ga filter frame 90 houses each of the individual removable air treatment modules 75 such as filters 76 a 76 c as shown in fig4 a 4 b and 6 a 6 c filter frame 90 includes directional ducting 74 u2032 for providing air flow through each filer 76 a 76 c fan housing.