Breathe easy knowing your Winix air purifier is working at peak performance with these genuine replacement filters! This 2-set combo includes everything you need - two HEPA filters that capture 99.97% of airborne particles as small as 0.3 microns (that's pollen, pet dander, dust, you name it) PLUS two activated carbon pre-filters that tackle odors from cooking, pets, and smoke. Specifically designed for Winix 5510 and 5520 models only - double-check your unit before ordering! Together, these filters should last you 8-12 months of continuous use, keeping your air fresh and clean. The HEPA filter traps all those microscopic particles you don't want to breathe, while the carbon layer absorbs everyday household odors. Installation is super simple - just follow your purifier's instructions for replacing the old filters. With Leemone's 24/7 customer support backing every purchase, you can buy with confidence. Keep your air quality top-notch and your family breathing healthy with these quality replacement filters!