Lennox part number X0582 Carbon disposable pleated panel filter Nominal size 16" x 20" x 5" (Actual size 16" x 20" x 4 1/4") A simple solution for controlling both odors and dust particles! Odorous gases and vapors are attracted to and held by the unique properties of the activated carbon material. Can be installed in virtually any HVAC system without modifications. Ideal applications include odors from cooking, new paint, new carpet, bathroom smells, cigarette smoke odor, and pet odors.