Abstract: In the electronic equipment shelter disclosed herein, protection of electronic equipment from both normal and abnormal environmental conditions, including severe electromagnetic pulses, is provided by employing a construction in which panels having inner and outer aluminum skins are joined together in an assembly employing extruded box tubes at each edge with the outer skins being welded to each other and to the tubes so that a complete conductive envelope is obtained. The necessary door opening is made electromagnetically unitary with the main shelter body by metal spring finger gaskets which are compressed by means of a multiplicity of linked dogging assemblies all around the door frame.

Abstract: An adjustable damper or air flow control valve for clean room systems, laminar flow benches, filter diffusers, fan/filter units and the like includes a fixed plate defining a plurality of rows of apertures. The plate is fabricated from an aluminum-clad fiberboard. A movable, foam plate is positioned on the fixed plate. The foam plate is fabricated from a cross linked polyethylene foam and also defines a plurality of apertures. The foam conforms to the fiberboard plate and prevents cross flow between adjacent apertures. Relative movement between the two plates moves the apertures into and out of alignment to control the flow of air to a filter.

Abstract: An air filtering system of the type used in clean rooms and the like supportable from a ceiling. The unit includes a supporting frame with an opening therethrough, the supporting frame being suspended from the ceiling by cables or the like. A filter having a filter frame therearound is placed within and across the opening in the support frame. A cutting wire is positioned between the supporting frame and the filter frame around the periphery of the opening. One end of the wire is free and extends below the two frames. The other end is fixedly secured to either the filter or support frame. A cuttable seal is applied between the filter and support frames around the periphery of the opening. Clips are also provided to hold the filter within the opening. When one wishes to remove the filter, the free end of the cutting wire is pulled, cutting the seal around the periphery of the opening, thereby allowing the filter and filter frame to be removed from the support frame opening.

Abstract: A demountable transporter for ISO containers has attaching elements with quick attachment latches including shear blocks, for insertion into the openings of the corner fittings, and locking plates, for insertion into the interior cavity of the corner fitting where they may be turned to secure the locking plate. Wheeled jacks are mounted on the lower attaching element of the transporter for easy movement of the transporter to the container and subsequent alignment. The two transporter sections may be joined together without the container by means of the lower attaching elements fastening to a joining block having openings like an ISO corner, and joining plates on the frames of the sections to which the upper attaching elements of opposite frames may be secured.