HQRP HEPA Dust Cup Filter 2-Pack for Eureka WhirlWind 3272AV, Z4237AZ Z3276AZ Z3277AZ ZC3270, ZAS10 Airspeed / Z32 Powerglide Vac Vacuum Cleaner Coaster HQRP&reg; Two HEPA Filters plus HQRP&reg; Coaster; This filter is H13 filtration class and retains 99.99% of particles down to 0.3 micron; 100% Compatible with Original filter; 2 weeks DOA replacement warranty!