HQRP HEPA Filter and Foam Filter Insert for Dirt Devil F66 / F-66 / Ud70100 / 304708001 Replacement + HQRP Coaster HQRP HEPA Filter and Foam Filter Insert; 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. 100% Compatible with Original filter; 2 weeks DOA replacement warranty!