EFP Humidifier Filter Replacement for Duracraft AC-813 Procare AC813 AC-813PC (4-Pack) Aftermarket Product Sourced Exclusively by EFP - Exact Fit Parts High Quality Humidifier Wick Filter for Duracraft DH830, DH-830, DH832, DH-832, AC-813, AC813 Includes (4) Humidifier Filters as pictured Approximate Measurements: 5-15/16" L x 3-15/16" W x 1-7/16" T