HQRP Filter 4-Pack for Eureka WhirlWind 3272 3272AV, WhirlWind Plus 3279AZ, 3277AVZ, 3277AVZX Upright Vac Vacuum Cleaner Coaster HQRP&reg; Four Filters plus HQRP&reg; Coaster; This glass fiber paper filter is H13 filtration class and retains 99.99% of particles down to 0.3 micron; Compatible with Original filter; 2 weeks DOA replacement warranty!