Hunter 30973 Air Purifier Replacement Filters,(2), with 2 Carbons,+ 4 Prefilters, High Tech 4 Stage Filters, Generic, Fits 30405, 30406, 30407 Affordable Hi Tech 4 Stage Double Filtration Design Takes out: dust, smoke,mold,cancer causing particles, etc. Better than the best filter on the market Lasts 12 months with pre-filter replacement ($1.25 each) Captures 99.9% of contaminates in the air