Abstract: A device (10) is used to maintain climate conditions within an interior space (12) of a vehicle such as an ambulance (14). The device (10) includes a blower (18) to generate an air flow and a mounting plate (20) cooperating with a cover (29) to direct the air flow across an opening (16) into the interior space to form a wall of air to prevent loss of the climate conditioned air within the interior space. The vehicle could also be a food service truck, a people transport bus and a boat.

Abstract: A compact condenser system has a compact arrangement that also increases the efficiency of the condenser. The compact condenser comprises two heat exchangers fixed opposite each other on a frame and at least one fan is interposed between the heat exchangers so as to draw air through the second heat exchanger and push air through the first heat exchanger while refrigerant flows from the first heat exchanger to the second heat exchanger. Liquefaction of the refrigerant with two opposed heat exchangers increases the efficiency and compactness of the condenser.

Abstract: A self-cleaning heat exchanger (10) has a reversible fan (12) located between two tube banks (14, 16) with a pressure switch (24) connected thereto. The fan (12) rotates in one direction blowing across the first tube bank (14) and drawing air over the second tube bank (16). The pressure switch and fan are interconnected by two relays (28, 30). When the refrigerant pressure in the tube banks exceeds the threshold pressure, the relay (28) is closed and grounded and electric current flows through the relay (30). The change in direction of current flow will reverse the polarity of the windings in motor (13) and thus the rotation of the motor (13) and the fan (12) thereby reversing air flow to remove debris from one tube bank while withdrawing heat from the other without loss of cooling efficiency.

Abstract: An air deflector unit for use on a vehicle to improve aerodynamic flow of air around the vehicle includes a forward facing shield having a forward facing air inlet therein and an inwardly facing air exhaust. An air flow passage is defined between the air inlet and the air exhaust. An air conditioning compressor is mounted in the air flow passage. Flow of air through the condenser is controlled by controlling louvers positioned in the inlet. Control is in response to the operation of the air conditioning system of which the compressor is a part.