Hoover Self Propelled Wind-tunnel High Efficiency Hepa Filter Genuine Part # 40110001 Hoover Self Propelled Wind-tunnel Upright Vacuum Cleaner High Efficiency Final Hepa Filter Fits Models : U6445906, U6476910, U6471900, U6476900, U64019RM, U6434900, U6436900, U6439900, U6420900, U6471900 Genuine Part # 40110001.