Filters-NOW RH30925 30925 Hunter Air Purifier Filters Hunter Replacement Filter Fits Hunter models 30100, 30110, 30125, 31077, 37125, 30140, 30150, and 30165. 3-stage multi-purification filter. The first filter removes large dust particles, lint and hair from the dirty air. The second sub-micron filter captures airborne particles as small as .1 microns from the air. This is an aftermarket filter.