Abstract: A method and device for concurrently transferring sensible heat from the warmer of either an incoming outside airstream or an outgoing exhaust airstream to the other stream and transferring latent heat from the wetter of either the incoming outside airstream or the outgoing exhaust airstream to the other stream prior to the incoming airstream entering a standard heating and air conditioning unit. The method and apparatus both employ a rotating heat wheel impregnated with a dry desiccant such as silica gel in order to accomplish the simultaneous transfer of both sensible and latent heat between the two airstreams.

Abstract: An energy efficient housing assembly employing a single inlet backwardly inclined blower fan for use in commercial HVAC units. The housing assembly is provided with a slanted wall to which a fan supply motor is slidably mounted. The slanted wall, in conjunction with an opposite non-parallel side wall, two other walls and a top plate form an enclosed area in which the fan is rotatably mounted. Air enters the fan in a straight path through a single front inlet opening provided in the assembly and exits the assembly via a large bottom discharge opening. Air flowing out the bottom discharge opening is evenly distributed over heating elements provided in the unit adjacent to the assembly. The assembly is slidably mounted in the unit for ease in removing it from the unit.