AAF Flanders Series 225 Two-Ply Polyester Ring Panel Filters in the custom size of 30x30.
Flanders Ring Panel and Cube filters are made by heat sealing layers of synthetic filtering media together over an interior, corrosion-resistant steel support frame. An overcut of media outside the sealforms a built-in gasket (selvage) between the wire support frame and holding frame, which secures the filter and prevents air bypass. This special feature allows these filters to be installed without the use of retainer fasteners. Flanders Ring Panel filters can be ordered as standard single panels or as link panels. A link panel is made by heat sealing individual Ring Panel filter panels end to end to achieve desired dimensions.
Picture is not exact size listed, product may vary.