VILEDON CEILING FILTER: Viledon PA/560 G-10 micron is a progressively structured ceiling diffusion media created by Viledon to optimize laminar air flow. Manufactured from thermally bonded synthetic fibers, Viledon's diffusion media has set the standard in paint booth filtration world wide. With it's scrim back Viledon is the most efficient ceiling diffusion media filter out there. This particular filter is 37 inches by 78 inches containing 4 in each case.