This genuine Hoover Type B, allergen fighting vacuum bag is designed to help your vacuum reduce the number of allergens present within your home. These vacuum bags work in several Upright Series, as well as Royal, Perfect and Titan Commercial vacuums. It. Hoover Vacuum Bags Type B Allergen OEM # 4010102B.  Disposable bag includes 3 bag per pack  These are allergen filtration vacuum bags.