These humidifier wicking filters are compatible with Honeywell machines that use Filter type A, HAC-504, HAC504, HAC-504AW, HAC504V1. <br><br> <b> Compatible with Honeywell Models </b><br> HCM-300 Series: HCM-300T, HCM-305T, HCM-310T, HCM-315T, HCM-350, HCM-350B, HCM-350W. <br> HCM-500 Series: HCM-530, HCM-535, HCM-535-20, HCM-540, HCM-550, HCM-550-19, HCM-551, HCM-560. <br> HCM-600 Series: HCM-630, HCM-631, HCM-632, HCM-632TG, HCM-635, HCM-640BW, HCM-645, HCM-646, HCM-650. <br> HCM-700 Series: HCM-710. <br> HCM-1000 Series: HCM-1000, HCM-1000C, HCM-1010. <br> HCM-2000 Series: HCM-2000C, HCM-2001, HCM-2002, HCM-2020, HCM-2050, HCM-2051, HCM2052. <br> HEV-312, HEV-355. <br> <br> Compare to part # HAC-504, HAC-504AW, HAC504V1. <br> <br> <b>Please Note: </b><br> This is not OEM product. It is replaces filter product. Use OEM brand name or model name designations for this product only to demonstrate compatibility. <br> <br> <b>Package includes: </b><br> 4 Replacement Wicking Humidifier Filters