Abstract: An instructional kit suited for teaching the necessary materials, methods and techniques for conventional stick built wood structures is provided. In accordance with the present invention, a kit for stick framing a true representation of a scale house model includes all of the framing members required to build a scale model house. Specifically, the kit includes precut framing members representing each of the correct members used in actual residential construction such as studs, rafters, sills, top plates, headers, etc. Also included in the kit are wall layout plans and detailed instructions regarding the proper construction of a residential house. The intent of the kit is to provide a self contained educational tool for teaching the necessary understanding of structural wood framing.

Abstract: A heat recovery apparatus for increasing the efficiency of a furnace having a cold air return, a burner, a hot air outlet, and a hot air exhaust. The heat recovery apparatus comprising a finned coiled heat exchanger located in the exhaust and having a water inlet and a water outlet. The water outlet connected via a silicone tube to a second water inlet on a core heat exchanger located in the cold air return. The core heat exchanger having a water outlet connected via second silicone tube to a water reservoir tank. The water reservoir tank containing water and a pump submerged within the water. The pump having a third water inlet and a third water outlet. The third water outlet being connected via a third silicone tube to the water inlet of the coiled heat exchanger. The heat recovery apparatus increasing the efficiency of a non-high efficiency furnace.