Holmes HWF75 Wick Filter is. a Genuine OEM Holmes Filter.. HWF75 Wick Filter fits HM3500, HM3600, HM3640, HM3650.. Holmes HWF75 Wick filter produces moisture.. Filter Dimensions, inch. 10 (Diam.) x 7 x 1. Filter lifetime: 2 to 3 months on average.. Treated with Microban anti microbial and anti bacterial protection