Abstract: A prefabricated panel comprising a pair of panel forming members wherein each of the panel forming members is made up of a continuous sheet of material of uniform thickness. The panel forming members are mechanically secured together by a plurality of spaced apart sub-girt members. The panel forming members may be used with or without an insulation means. The panel forming members are laterally offset from each other, and they may have various profiles or identical profiles.

Abstract: An explosion venting wall structure incorporating a releasable fastener means. The fastener means comprises a fastener member having a substantially circular body with an opening therethrough, and at least two offset arms extended radially outward from said tubular body. The fastener member circular body is adapted to be disposed in a circular opening in a wall structure, with the offset arms overlapping the opening edge and seated against the wall surface, and with a screw or other retainer means provided for extension through the circular body opening and through said opening in the wall and into securing engagement with a building structural support member.