EnviroCare Replacement Vacuum HEPA Filters for Hoover Self-Propelled WindTunnel 2 filters Fits: Hoover Upright, Self propelled WindTunnel (2) Hoover WindTunnel Self Propelled HEPA w/activated Charcoal Filter Fits original manufacture part numbers below: 40120101, 3613021, 43613-022, H-40120101, H-43613021, STR42651 Dimensions: 10 7/16" x 3 5/16" x " EnviroCare Premium aftermarket Part #918