Patent ID: 6606876
Filing Date: 2003-08-19
Classification: B60H,B61D

Abstract:
Sound attenuation apparatus for use in a small bus that contains an air conditioned passengers compartment, said apparatus includingan air conditioning unit that includes an evaporator that is secured to the outside of a rear wall of said bus, said rear wall having a centrally located opening through which return air from the passenger compartment is drawn into the evaporator, fan means for drawing return air into the evaporator and distributing conditioned supply air back to the passenger compartment through supply air ducts, a housing mounted inside said bus over said central opening for enclosing said opening, said housing having a front wall that extends laterally to either side of said opening; each extended section of said housing containing a return air aperture such that return air passing through said apertures is forced to follow a tortuous path of travel between said apertures and said opening thereby attenuating the sound of the return air flow.