What was found
3,400 PSI WORKING PRESSSURE AIR CAUSED THE PERFORATED PLATE TO CONFORM TO THE SHAPE OF THE CONCAVE OUTLET COVER AND THEN BREAK BETWEEN PERFORATIONS IN THE CENTER OF THE PLATE. THE FELT FILTER THEN EXTRUDED THROUGH THE BREAK IN THE PERFORATED PLATE AND INTO THE OUTLET PASSAGE OF THE OUTLET COVER REDUCING THE FILTER ASSY'S FLOW CAPACITY. THE PERFORATED PLATE IS UNSUPPORTED IN THE CENTER AND IS UNABLE TO WITHSTAND PRESSURE CREATED WHEN FELT FILTER IS PARTIALLY CLOGGED OR COATED WITH ICE. SUBMITTER SUGGESTED PERFORATED PLATE BE MADE STRONGER AND/OR SUPPORTED BY (PERFORATED) SUPPORT COLUMN AROUND THE FILTER OUTLET PASSAGE.