Filtrete HEPA vacuum filters are designed according to strict HEPA standards. The media in these filters help trap 99.97% of all airborne pollutants 0.3 microns or larger, including mold spores, pet dander, grass, ragweed pollen and other microscopic allergens. Fits models: Hoover EmPower, Savvy, WindTunnel bagless uprights with the Twin Chamber system.