Humidifier Filter Holmes E HWF100UC3 HWF100 (3 Pack) Sourced exclusively by EXACT FIT PARTS Replaces Filter E, Part Number HWF100-UC3 High Output Interwoven Filter Design Natural and Clean Humidification - No White Dust Approximate Measurements: 7-9/16" L x 5-1/4" W x 15/16" T