Restore cleaner indoor air with a True HEPA and carbon pre-filter replacement set compatible with Electrolux EL480A / EL490A / EL491A Oxygen3 PlasmaWave air purifiers, Replacement for EL017. The True HEPA filter captures up to 99.97% of particles as small as 0.3 microns to help reduce dust, pet dander and hair, cigarette smoke, and other airborne impurities. Four activated carbon pre-filters help trap larger particles to protect the HEPA filter and reduce odors in the environment, supporting better airflow and fresher air in bedrooms, living rooms, and other home spaces. Recommended maintenance: replace the True HEPA filter every 6 to 12 months depending on use and replace the carbon pre-filters about every 3 months. Set includes 1 HEPA filter (16.34 in x 12.60 in x 1.18 in) and 4 carbon pre-filters (16.34 in x 12.60 in x 0.12 in). Disclaimer: This is not an Original Equipment Manufacturer (OEM) product, HQRP branded product is a replacement. All brand names and logos are registered trademarks of their respective owners. Any use of the brand names or model designations for this product are made solely for purposes of demonstrating compatibility.