Abstract: A heat exhaust system for installation in the space behind the refrigerator of a recreational vehicle for disposal of heat that builds up behind an RV refrigerator from the operation thereof. The system operates automatically to turn on a fan to dissipate the heat at a predefined high temperature, and operates automatically at a predefined low temperature to turn off the fan thereof.

Abstract: A vertically elongated thin, generally planar body constructed of at least reasonably stiff and shape retentive material is provided including opposite ends and opposite face sides and edges extending between the ends. The upper end portion of the body includes a plurality of integral angulated tangs struck therefrom, projecting outwardly from the face sides and inclined outwardly from the body toward the lower end of the body. The tangs include sharpened outer lower ends and the lower end of the body includes support structure from which an article to be suspended beneath a pan roof of the type including at least one pair of laterally adjacent elongated pan roof sections including adjacent longitudinal side upwardly projecting closely juxtaposed flanges may be supported.

Abstract: In a conventional hand truck, a stair tread engaging device having reduced friction and improved mobility provided by a plurality of rollers each rotating freely in its own socket and only on its own axis without forward movement.