EFP Humidifier Filter Replacement Honeywell HAC-504AW HAC-504 Filter-A Aftermarket Product Sourced Exclusively by EFP - Exact Fit Parts High Quality Humidifier Wick Filter replaces Honeywell HAC-504 / Honeywell HAC504, HAC-504AW / HAC504AW Approximate Measurements: 17-1/2 x 4-3/4 x 1 Includes (1) Humidifier Filter as pictured