An enclosure includes at least one elongate, substantially planar wallmember and at least one post member having at least one each channel, witheachwall member having an edge which fits into at least one edge channel, the edgeof thewall member having a plurality of spaced-apart projections which extend fromeachside of the wall member, and the edge channel having a pair of spaced-apartandsubstantially parallel flanges between which the edge of a wall member isreceived.An abutment shoulder is provided on at least one of the substantially parallelflangesin order to engage the projections on the wall member to allow passage thereofin afirst direction but preventing passage in a second, opposite direction.
