Premium activated carbon pre filter compatible with Honeywell Type K HRF-K2. It fits Honeywell air purifier model HFD120/140, HFD300 series, HFD310, HFD320, HFD280 and HFD230. A pack of 2 filters included. This is not a Honeywell OEM product. The Honeywell brand names and logos are the registered trademarks of their respective owners. Any use of the Honeywell brand name or model designation for this product is made solely for purposes of demonstrating compatibility.