EXCELL-HVAC HEPA BIO FILTERS are designed with continuous sheet of special micro fine glass-fiber filter medium is pleated into a vee configuration with corrugated aluminum separators inserted between the pleats. This forms the filter element, which is bonded into a rigid corrosion-resistant steel frame with all joints encapsulated and sealed in a special urethane elastomer. Standard filters have a closed-cell neoprene gasket on the air-leaving side, and filters for fluid seal installation have an extended frame with a 60 mm skirt to engage the sealant channel. Filters are produced in a wide range of face dimensions and in two standard depths of 150 mm and 300 mm nominal.