Aftermarket Replacement Pads (2-Pack) for American Red Cross Cool Mist Humidifier - The First Years Learning Curve Replacement pad or humidifier filter for american red cross cool mist humidifier. Convenient 2 pack. Filters measure 6. 5" x 1. 5" x 4". Cut from quality bulk filter material. Metal support layer (in the middle) helps filter retain it's shape!