ZVac 2 Package Hoover HEPA Filters Replaces Part # 303172001 Fits Windtunnel T-Series Upright Vacuums, Windtunnel MAX, Remedy, T-Series, T, T6, Allure and Other Models Only From GoVacuum This filter captures microscopic particles The filter cartridge includes the plastic frame or tray already installed into the new one Captures 99.97% of all airborne allergens as small as 0.3 microns. 2 pack