As the previous poster said A/C may have to be an option and as far as a filter goes you have 4 options, buy that very expensive looking filter from sun light supply co make sure its rated for the air flow you will be pulling, Diy your self and inline filter probably not a good idea considering how much air you will be moving, buy some hoods that have an intake on them so you can attach a carbon filter at the intakes, or put an inline ozone generator in.