Accumulair Carbon 18x24x1 (17.5x23.5) Odor eliminating Air Filter/Furnace Filter Nominal size 18x24x1, actual size measures 17.5 x 23.5 x 0.75 Carbon impregnated disposable pleated panel filters Ideal applications include odors from cooking, new paint, new carpet, bathroom smells & pet odors A simple solution for controlling both odors and dust particles Lasts up to 90 days