HEPA filter with anti-viral properties has an efficiency level of 99.97% at 0.3 micron 360 degree filtration draws in air from all directions, collecting pollutants from around the room Change indicator light glows red on your air purifier when the filter needs to be replaced For best results, it’s recommended to replace the Allergy and Flu HEPA filter drum every 12 months (depending on usage) 20.87 x 21.2 cm Use with Z-3000 / Z-3500 Air Purifier Best for allergies and flu Pack includes: 1 x Mesh Prefilter, 1 x HEPA filter, 1 x Carbon filter Mesh Prefilter only, wipe clean
