Blocked filters will reduce the suction in your vacuum cleaner. Cleaning and replacing your filters regularly will help to maintain its best performance. This filter efficiently filters and retains particles vacuumed by your cleaner. Maintaining a dust-free environment is an important step towards a healthier life for the whole family. This filter is for The Boss Z 41.. range of cleaners. We recommend that filters should be replaced at least twice a year or when they become visibly soiled.