The Carrier P110-0006 Humidifier Filter Replacement is a foam furnace evaporator pad that traps mineral pollutants found in water and helps to avert them from entering your home. Depending on usage and hard water quality, replace your P110-0006 twice a season for optimum performance. The dimensions of this humidifier filter are 7 1/2" x 26 1/2" x 1".