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An air conditioner unit that includes a housing containing a heat exchanger and a centrifugal impeller positioined behind the heat exchanger for drawing comfort air over the exchanger surfaces and returning the air to a comfort zone. A support wall is placed between the heat exchanger and the inlet

An air conditioner unit that includes a housing containing a heat exchanger and a centrifugal impeller positioined behind the heat exchanger for drawing comfort air over the exchanger surfaces and returning the air to a comfort zone. A support wall is placed between the heat exchanger and the inlet of the impeller and an orifice is mounted in the wall for directing conditioned air into the fan inlet. A cylindrical shield is also mounted upon the wall and surrounds the orifice. The shield is axially aligned with the impeller and its end face positioned adjacent to the inlet face of the impeller. The axial length of the orifice from the wall is less than that of the surrounding shield so that a wide circular throat is established around the entrance region of the impeller. The velocity of air drawn through the gap between the shield and the impeller is thus reduced within the throat to minimize its adverse effect on the primary air flow entering the orifice.

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In an air conditioning unit having a housing containing a heat exchanger and a centrifugal impeller blower has an inlet opening facing the back of the heat exchanger so that the impeller draws comfort zone air over the heat exchanger surfaces and return the air to the comfort zone, said unit further

In an air conditioning unit having a housing containing a heat exchanger and a centrifugal impeller blower has an inlet opening facing the back of the heat exchanger so that the impeller draws comfort zone air over the heat exchanger surfaces and return the air to the comfort zone, said unit further including, a hollow orifice mounted behind the heat exchanger having a passage for conducting comfort zone air to the inlet region of the impeller, the discharge end of the orifice being spaced from the inlet face of the impeller to provide a circular throat around the impeller, and a circular shield surrounding the orifice and having an end face that is positioned adjacent the inlet face of the impeller to provide a narrow gap therebetween, the width of the gap being less than the width of the throat, whereby the air flow drawn radially through said gap is expanded rapdily in the throat to reduce its velocity prior to entering the inlet region of the impeller.