FRAMED AIR FILTER, PROGRESSIVE FILTERING FILTER MEDIA: NON-WOVEN, COMPOSED OF COTTON FIBERS REINFORCED WITH SYNTHETIC FIBERS, RADIAL PLEATED. ON ITS ENTIRE SURFACE THE FILTERING MEDIA IS SUPPORTED AND ADHERED TO A WELDED WIRE GRID WITH AN OPEN AREA GREATER THAN 96%. NOTE: EXTENDED AREA OF THE FILTERING MEDIA EQUAL TO FIVE (5) TIMES THE FACIAL AREA OF THE FRAME: FRAME