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 255649-103. You can use this air filter media in Air Bear Supreme, Right Angle, and Cub filters with accommodating sizes. The actual dimensions for this replacement filter are 20.69 inches tall, 19.75 inches wide, and 5 inches deep. Not all filters are created equal. To ensure this is just what you need, we recommend checking measurements prior to ordering. 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 8 rated and maintains efficiency under all operation conditions. 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.