Honeywell HEPAClean Filter U Air Purifier Filter captures 99% of airborne particles at 2 microns and larger, ensuring cleaner air in your living space. This air purifier filter features a built-in carbon pre-filter that effectively reduces unpleasant odors from pets, cooking, and smoke, helping to maintain a fresh and pleasant environment. Designed for optimal performance, it is to replace the filter every 4 months. The filter measures 10.1 inches in length and 4.9 inches in width, making it a fit for compatible Honeywell air purifiers. Model Number: