Abstract: A baffle for a heat exchanger tube extending between opposed header pipes. The baffle is a longitudinal member with a concave underside shape conforming to the convex circumferential shape of the heat exchanger tube, and has a length substantially equal to the distance between the header pipes. A lip having a convex top side shape conforming to the concave underside shape of the longitudinal member extends along one longitudinal edge of the member. Two such members can be nested together by overlaying the non-lipped longitudinal edge of a one member atop the lipped longitudinal edge of the other member. A plurality of longitudinally aligned heat vent slits extend substantially the entire length of an uppermost portion of the member.

Abstract: A framework is constructed using posts having side walls in which vertically aligned and spaced-apart slots are formed. The posts support frame members having end edges which abut the side wall. A pair of hooks on the end edge enter into a pair of slots and, when the frame members are moved relative to one another, the hooks engage the side wall and the end edge is clamped to that wall. The end edges have locking tabs which are bent into a slot to prevent disengagement of the frame members.