Abstract: A door assembly system for a shielding enclosure capable of attenuating RFI and EMI emissions, comprising of a separable waveguide attenuator structure assembly with triple track rails and channels for the disposition of electromagnets separately wound and energized, peripherally formed around the door casing member, inwhich is engaged with a door leaf member when in a closed position. Electromagnets are operatively connected and directly wired without the need for electronic filtering devices to the electronic control box unit located inside enclosure. Exterior door leaf sheet and trim are welded or preferably removable enabling the addition of security components and replacement of parts. A automatic door closure device pulls the door leaf members into close proximity to the pole faces of waveguide structure, which engages a switch to activate the electromagnets.