Clogged filters impair the vacuum cleaner\'s suction capacity. Cleaning and changing filters regularly helps maintain the best performance. This foam filter captures even the finest particles so that they are not swirled in the air when vacuuming. The outlet filter purifies the air leaving the vacuum cleaner and reduces the risk of allergic reactions. In order for the vacuum cleaner to work as well as possible, all filters should be replaced at least twice a year or when they are visibly dirty. Check compatibility before purchase.