<p><strong>Fusion Filters is the industry leader in premium quality filter replacements.</strong> All our filters are proudly designed in the USA and exceed all quality standards of excellence. Our products are scientifically designed to remove pollutants while preventing the growth of mold, fungus, algae, and bacteria.</p> <p>Compatible with Honeywell Humidifier Models: HAC-504, HAC-504AW & HAC-501V1.  These filters also replace the following models:</p> <p><strong>HCM-300 Series:</strong> HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B, & HCM-450BCST</p> <p><strong>HCM-500 Series:</strong> HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, & HCM-560</p> <p><strong>HCM-600 Series:</strong> HCM-630, HCM-631, HCM-632, HCM-632TG, HCM-635, HCM-640BW, HCM-645, HCM-646, & HCM-650</p> <p><strong>HCM-700 Series:</strong> HCM-710</p> <p><strong>HCM-1000 Series:</strong> HCM-1000, HCM-1000C, & HCM-1010</p> <p><strong>HCM-2000 Series:</strong> HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM2052, HEV-312, & HEV-355</p> <p><strong>Enviracaire Series:</strong> ECM-250i</p> <p>NOTE: This is NOT a Honeywell OEM product. The Honeywell and Enviracaire brand names and logos are the registered trademarks of their respective owners. Any use of the Honeywell and Enviracaire brand names or model designations for this product are made solely for purposes of demonstrating compatibility.</p>