Humidifier Filter for Essick Air MoistAir EF1, EF21 (3 Pack) Product Description Brand New - Unused Wick Filters Includes Three (3) Humidifier Filters as pictured Item Specifications: High Quality Humidifier Wick Filters for Essick Air MoistAir EF1, EF21 High Output Interwoven Filter Design Traps and Retains Mineral Deposits Metal Reinforcement Structure Adds stability to the new, softer and more absorbent paper filter Prevents 'slumping' or 'sagging' over time or when wet Natural and Clean Humidification - No White Dust. Approximate Measurements: 8" x 31" x 1" OUR PLEDGE TO YOU: Fit and Function Guarantee This part is a top quality, generic replacement part. Fit and function are guaranteed for 30 days or your money back. - Any reference to brand or model numbers is intended for identification purposes only. Many replacement parts should be installed only by a professional. Be safe. If you are not qualified to install this item, you are more than welcome to return it.