Keep your air cleaner running its best by replacing the filter media every few months. When it's time to replace the filter in your Trion Air Bear air purification system, look to the Trion High Performance Replacement Air Filter to keep your air clean and breathable. This air purifier filter replacement is Trion part number 259112-102. You can use this air filter media in Air Bear Supreme, Right Angle, and Cub filters with accommodating sizes. This replacement air filter measures 20 inches high, 25 inches wide, and 5 inches deep (size does not include 0.25-inch gasket located along the top and bottom edges of the filter). Trap dirt, dust, pollen, pet dander, and other airborne particles as small as 1 micron in this air filter. This high-efficiency air filter is MERV 11 rated with electrostatically-charged synthetic filter material. The non-woven, 5-inch thick, pleated filter media retains its shape even when dirty or when air pressure drops, guaranteeing that the filter captures as much dirt and dust as possible. The factory-installed double gasket eliminates the need for filter bypass. Enjoy cleaner air in your home by replacing an old or dirty air filter with the Trion Replacement Air Filter.