Also referred to as filter 43613021, this Hoover High Efficiency Final Filter 1 pack fits Self Propelled Hoover WindTunnel® vacuum cleaners. Frame may be black or white. The filter fits inside the filter door on the side of Self Propelled WindTunnel uprights. The filter measures 10 7/16" x 3 5/16" x 1/2". Please note: This is not a HEPA filter and does not fit NON-Self Propelled WindTunnel units.