This genuine Hoover Bagless Canister HEPA Exhaust Filter fits inside the retainer on the side of the Hoover Bagless WindTunnel Canisters. It consists of fanfold filter media in a round black plastic cartridge. This filter provides a high level of filtration which meets the stringent HEPA specification for the air that passes through it.   For similar products see our list of Hoover Vacuum Supplies.