Humidifier Filter Replacement for Duracraft AC-818 AC-819 (3-Pack) Aftermarket Product Sourced Exclusively by EFP - Exact Fit Parts High Quality Humidifier Wick Filter for Duracraft AC-818, AC818 Includes (3) Humidifier Filters as pictured Approximate Measurements: 8 1/2" x 8 3/8" x 2"