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 MIL-HDBK-232A
60.6 Treatment of apertures for EMP/HEMP. All apertures must be treated to
ensure a complete shield. All doors should be coupled to the skin by
installing jumpers. At least three jumpers should be used. They should be
welded to the door and wall skin. Air-conditioners should have metal mesh
screens installed inside all panels which have filter apertures in them and
in the duct into the shelter. Screens should be cut, installed, and
circumferentially welded as depicted in figures A-8 and A-9. Only metal mesh
filters should be used and should not be removed except for cleaning. The
facility entrance plate should be metal and should be circumferentially
welded to the skin of the shelter. All connectors which penetrate the
entrance plate should be metal and should be circumferentially welded to the
plate. All connectors should be equipped with metal-threaded caps screwed
onto the connectors when not in use.
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