DuoVac Filtre-189 Bags for central vacuums will prevent you from having to handle the dirt, dust and debris accumulated over months of vacuuming. The DuoVac Filtre-189 Bags fits the Spirit & Air 10 Series. When emptying your canister, vacuum bag units are much cleaner than non-bag central vacuums. It is very important for maintaining your central vacuum to frequently change your central vacuum bags. We recommend changing your Filtre-189 Bags every 3 to 4 months for the best performance from your central vacuum.