DELTA series absolute lters for unidirectional ows Technical features Product Efciency MPPS Suggested nal pressure drop Maximum pressure drop Maximum operating temperature Maximum relative humidity ATEX version on request DELTA series DAB - DAA absolute lters are mini-pleated, with very high ltration efciency; DAB lters belong to HEPA class, whereas DAA lters belong to ULPA class. They are made of a mini-pleated glass ber sheet with continuous thermoplastic separators. It is xed to the frame by means of a polyurethane sealant. The medium is protected by white epoxy painted micro-drawn steel protection grids. It is provided with a semi-circular expanded polyurethane one-piece gasket. DAB - DAA lters have a robust construction, high quality and moderate pressure drops which assure a long operating life and a limited energy consumption of the fan in the AHU. All the lters are individually tested through a scanning system to make sure there are no pinholes in the medium; at the end of the test they are labeled with the test results. Filtering surface Initial pressure drop Product ready in Stock / *1 m3/s x 10-3 = 1 l/s Typical curves Technical draft Nominal air flow rate % Nominal air flow rate % If filters are used in turbulent flows with high air flow rate, efficiency levels may drop by one class; in case of any doubt consult our technical office. Special type: low pressure drop version LPD available.