Hunter HEPAtech™ - Replacement Filter 30930 Through six months of continuous use, this filter removes such contaminants as smoke, pollen, dust, mold spores, pet dander, and allergens. 1 micron in size. For the best performance, replace your filter every 6 months. 97% of particles as small as 0. This filter features a white cardboard frame with white HEPAtech material on its front and black carbon to help remove odors on the back. HEPAtech Filters are permanently charged electrostatic filters that effectively capture 99.