3M Filtrete Allergen Filtration Hoover Fold Away and 50 Vacuum Filter 64801B. Allergen Filtration help trap household dust. Fits Hoover Models: Hoover Fold Away 51000 Series, TurboPOWER 3100 Series, U5162906, U5162911, U5164900, U5165900, U5167900, U5167950, U5170900, U5172900, U5173900, U5173950, U5174900, U5175900, U5175950, U5176950, U5177900, U5178900, U5179900, U5179906, UH40155, UH40185 and UH40190 Models. 1 Filter in Package. Manufacturer Part Number: 64801B.    HR-1823