Type-B allergen bags deliver a high level of filtration for common allergens to effectively trap 99 percent of dust and pollens down to 5 microns. Easy-to-install design goes on and removes quickly for time-saving replacement. Disposable material allows you to conveniently discard filled bags for time-saving replacement. Allergen bags are designed for Hoover TaskVac commercial vacuum cleaners (sold separately).Type-B allergen bags deliver a high level of filtration for common allergens to effectively trap 99 percent of dust and pollens down to 5 microns. Easy-to-install design goes on and removes quickly for time-saving replacement. Disposable material allows you to conveniently discard filled bags for time-saving replacement. Allergen bags are designed for Hoover TaskVac commercial vacuum cleaners (sold separately).