HQRP 4-Pack Hepa Media Filter Exhaust for Hoover 303902001 UH70400 UH70400BCA UH70400CA UH70400FDI UH70400PC UH70400PDI Upright Vac Vacuum Cleaner WindTunnel Air Wind Tunnel Coaster HQRP&reg; Four Filters plus HQRP&reg; Coaster; This filter is H13 filtration class and retains 99.95% of particles down to 0.3 micron. Filters should be changed every 3 to 6 months. Compatible with Original filter; 2 weeks DOA replacement warranty!