Blocked filters will reduce the suction in your vacuum cleaner. Cleaning and replacing your filters regularly will help to maintain its best performance. This cassette filter captures even the very finest particles from entering the air while you clean. The exhaust filter purifies the air leaving the vacuum cleaner reducing the risk of allergic reactions. This filter fits the following cleaners: POWER OF RED Z8800AZ, Z8801AZ, Z8802AVZ. For optimum performance of your vacuum cleaner, we recommend you replace all filters at least twice a year or when they become visibly soiled.