Egevent EHFP ceiling type filter plenum is used to provide a suitable air environment with H13 and H14 filters in rooms that require sterilization such as optical, electronic, medical, operating rooms. Filter plenums are the main ventilation products used in the application of clean room technology. The HEPA filter box is made of stainless steel or painted DKP sheet as standard. The plenum serves to seal the filter and maintain hygienic conditions in the air duct system. They are produced in two types: side entry and top entry.