Our FR400 true HEPA filter replacement compatible with Austin Health-mate FR400, HM400, HM402, HM405, HM410, HM450 air cleaner purifiers. Please kindly check your machine model before purchasing! True HEPA Filter: Engineered with precision, this high-quality filter utilizes true HEPA technology to filter 99.97% of airborne particles as small as 0.3 microns, providing a healthier indoor environment. High-Efficiency Activated Carbon Filter: Activated carbon filter can effectively filter large particles in the air as well as some odors, such as pet odor, etc. which can effectively protect the carbon layer and HEPA and extend its service life. Package Include 1 x HM400 HEPA filter replacement + 2 x Pre-filters Warm Tips: It's recommended to replace every 12 months, depending on usage and the different air quality in each area. Kindly Notes: This product is a generic filter that is designed to replace the original part. Any brand names or logos are the registered trademarks of their respective owners. Any use of the brand name or model designation for this product is made solely for purposes of demonstrating compatibility.