HAP602 HEPA Replacement Filter Widely compatible with ECOSELF HAP602/HAP602 Wifi Version air purifier. The HAP602 high efficiency HEPA air filters capture 99.97% of airborne particles and particles as small as 0.01 microns. The activated carbon pre-filter absorbs smoke, cooking fumes and noxious odors from harmful volatile organic compounds. The activated carbon pre-filter of filter collects dust, pet hair, and other large particles, while extending the life of the HEPA filter. Treated carbon take in volatile organic compounds from the air and reduces odors from smoking, cooking and pets. Package includes 4 x HAP602 H13 True HEPA Filters. For the best performance, it is recommended to replace the HEPA filter every 6-8 months for the best performance (depending on your usage and environment), and obtain higher filtration performance for long-term use.