Our 700SG and 500AB and 300AB series pleated filter is a convenient replacement for the Spaceguard media 201 and the Trion Air Bear & Cub. These filters offer an easy and quick alternative that will save time and money when replacement of the original filter is necessary. All filters are 98% efficient (arrestance) when tested in accordance with ASHRAE testing method and are U.L. listed. A gasket is standard on all models. Each filter is sealed in plastic to prevent contamination before use.