Keep your Hunter air purifier running at its best with this 2-pack of replacement HEPA filters. Model 30964 and 30965. For HEPAtech tower models 30715, 30716, 30717, and 30770: these filters use advanced True HEPA technology to capture up to 99.97% of airborne particles as small as 0.3 microns. With a simple installation process, these filters will have your air purifier working like new again in no time.