Product review (5 stars): Also fits MANY different makes/models
Fits the following units as well.......

Holmes Humidifiers: HM-1645, HM-1730, HM-1745, HM-1746, HM-1750, HM-2200, HM-2220 (HWF-64, HWF64CS, HWF-64CS, HWF64PDQU, HWF64PDQ-U)
Bionaire Humidifiers: BCM-1745 (BWF-64)
Graco Humidifiers: 2HO2 (2H03)
Hamilton Beach Humidifiers: 05520, 05521 (05920)
Sunbeam Humidifier: SCM-1746, SCM-1747 (SWF-64)
White Westinghouse Humidifiers: WWHM-1645 (WWH-640)