Hoover's patented WindTunnel technology uses a unique ducted system to collect dirt and prevent it from being redistributed back onto the carpet. Once dirt has been picked up by the brush roll, it collects in the ducts and is prevented from coming into contact again with the agitator and being redistributed onto the carpet. Current bagless models dispense with filtration bags in favor of a clear dirt cup that you empty by hand. Over time, these secondary filters will eventually clog. As this occurs, the cleaning effectiveness of the vacuum will decline with it.
Vacuum bags make a difference too.
They're not just dirt collectors, but integral to the allergen filtration system. Hoover's allergen filtration bags perform two-stage filtration, capturing fine particles and returning filtered clean air to the room. Hoover's filtration bags are designed to let air flow from the vacuum to the exhaust, while trapping small particles such as dust mites. Because vacuum bags are part of the filtration system, replace the bag regularly. Replacing the filtration bag is a cost-effective way to revitalize the vacuum's airflow, cleaning effectiveness and allergen filtration to make sure you're getting the best results.