Genuine Electrolux HEPA and Carbon Filters EL017 - 1 HEPA, 4 carbon filters HEPA Filter filters out 99.97% of dust and other airborne irritants 0.3 microns or larger. Change filter every 6 months for optimum performance Contains 1 HEPA filter and four carbon filters. Carbon filter reduces odors and traps larger particles such as dust and pet hair. Fits EL490 model