Owner's Manual The Duovac Asteria Central Vacuum System features low noise emission technology motor to reduce noise, this central vacuum emits only 58 decibels, comparable to a normal household conversation. The hassle of buying and replacing bags is optional with the Duovac Asteria. This central vacuum system operates using a hybrid filtration system. Although you can choose to not use a bag, the Duovac Asteria implements double-filtration technology when used with a disposable filtration bag. Silpure technology prevents bacteria from spreading and multiplying within the filter by using a cutting-edge environmentally-friendly antibacterial technology. This keeps your filter from reeking of odor. The filter itself is also machine-washable, eliminating the need to clean filters by hand. The need for frequent emptying is reduced with the Duovac Asteria’s large aluminum dust container. It can hold up to 33.8 liters and can hold an additional 30 liters with a filtration bag. When maintenance is required, its LED maintenance indicator will light up for maximum convenience and increased motor longevity. The Duovac Asteria comes with a 25-year warranty. Labor costs for installation and maintenance are covered for the first 5 years.