Abstract: The invention relates to the construction and arrangement of wall components which are to be attached to the posts and spars of a basic frame for machines, instruments, equipment and the like. These wall components extend from the middle of one post to the middle of another and are supported on the upper faces of the posts and the spars between them by their folded upper web. The side edges of the web extend to approximately the middle of the face of the post and then run obliquely inwards. A section covering the posts at the top is recessed where the web is supported. Running around the inside edge of the wall component there is a frame-like spacer, the depth of which determines the distance by which the outer wall of the wall component projects beyond the outside of the post.