Accumulair 17.5x27x5 (17.2x26.2x5) Carbon Odor Block Aftermarket American Standard Replacement Filter Nominal Size: 17.5 x 27 x 5 Actual Size: 17.2 x 26.2 x 5 Carbon impregnated disposable pleated panel filters. A simple solution for controlling both odors and dust particles. Lasts up to 6 months. This filter is made by Accumulair.