HEPA Filter for Hoover  Self-Propelled WindTunnel 40120101 Aftermarket Product Sourced Exclusively by EFP - Exact Fit Parts Fits These Select Hoover Self-propelled WindTunnel Upright Vacuum Cleaner Models (partial list): U6423-900, U6425-900, U6425-920, U6425-950, U6431-900, U6445-900, U6445-906, U6445-920, U6449-900, U6450-900, U6451-900, U6451-960, U6455-900, U6455-960, U6458-900, U6460-900, U6470-900, U6470-910, U6471-900, U6474-900, U6476-900, U6476-910, U64019RM, U6420900, U6434900, U6436900, U6454900, U6471900 **Please note: This does not fit NON-Self Propelled WindTunnel units Replaces Obsolete Part Numbers: 40110001, 40120101, 43613021 Dimensions: 10-7/16" x 3-5/16" x 1/2"