The media pack, comprised of 100% polyester, is bonded to the inside perimeter of the enclosure frame by a moisture resistant adhesive,providing a continuous and positives.Pleated alumunium frame air filter AHU / FCU (aluminium frame filter) are designed for use in air filtration systems and equipment ( Blasting and painting equipment), as stand alone basic efficiency products or as pre-filters to higher efficiency bag, rigid box or cell type filter.