isinlive is the trusted brand for Quality Appliance Replacements, the replacement filter is designed and engineered to fit for HPA300 Air Purifier</br></br> isinlive 3 pack True HEPA Filter R, HRF-R3 Compatible with Honeywell Air Purifier HPA300 with 4 Pack Precut Activated Carbon Pre-Filters Replacement HRF-AP1</br></br> We offer 90 day Assurance. So you should have no worries when order.</br></br> <b>One Year Supply Filters</b></br> Package includes 3 premium true HEPA filters and 4 premium activated carbon pre-filters cut to size.Suggest to change the pre filter quarterly and the 3 hepas annually, or depending on the amount of usage and environment</br></br> This is not a Honeywell OEM product. The brand names and 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