This is a Genuine Hoover replacement Allergen Filtration Final Filter. This is a original Hoover filter and is used in in the Self-Propelled WindTunnel vacuums made by Hoover.
A clogged filter will cut out suction of your vacuum, and can put dust back into your home’s air, to maintain optimum performance you should change the filter every 3-6 months or as needed based upon usage.
This filter is known as the final filter, and will directly replace your old wind tunnel filter, packaged as a set of 2. This allergen filtration final filter is known by the manufactures part number 40110001, but is also commonly referred to as H40110001 or H-40110001.