The 14x20x1 Glasfloss Z-Line Series pleated filters offer improved performance for virtually every application. Z-Line filters now achieve a MERV 10 rating per the ANSI/ASHRAE 52.2 Test Standard. The Glasfloss Z-Line Series incorporates exclusive double wall internal torsion box technology. The Z-Line self-supporting pleated filters offer excellent performance and value for a large array of applications. The Glasfloss Z-Line Series offers the most complete line of pleated filters in the market. The mechanical structure of the media fibers sustains efficiency over the service life of the filter and produces high dust holding capacity. Glasfloss Z-Line Series pleated filters are used in a broad range of installations, from pre-filters for high efficiency filters to primary filters for computer room units.