Put fine dust and allergens in their place with the HPB1PK paper bag filters. Designed to fit Astro Vac, VacuMaid, Imperium, Valet central vacuum bag units and more. This two layer bag captures up to 98.4% of fine dust and allergens, thus making your living space cleaner and healthier. Easy to install. Simply remove the old bag, close off the opening with the adhesive flap, and throw away. Expand the new bag, fit the opening over the bag inlet fitting inside your central vacuum, replace the lid and you are ready to continue cleaning. Our smart 3 bag package means you always have a replacement bag ready when you need it.