Patent ID: 8926413
Filing Date: 2015-01-06
Classification: B60H

Abstract:
1. A vehicle heating, ventilation and air conditioning system comprising: a plurality of ducts for providing conditioned air to an interior of a vehicle, the plurality of ducts including a window defrost duct and a floor duct, a mixing chamber upstream of the window defrost and floor duct for mixing heated air with cooled air, the mixing chamber being a region of high turbulent air flow and the floor duct being a region of low turbulence air flow, respectively; a unitary damper selectively controllable to distribute the conditioned air from the mixing chamber to one or more of the plurality of ducts, the damper configured so that when in a window defrost mode position, the damper directs conditioned air in the mixing chamber to the window defrost duct through an opening in the mixing chamber, the damper further configured so that when in a floor-only mode position, the damper directs conditioned air in the mixing chamber only to the floor duct and prevents conditioned air from entering the window defrost duct via the opening; a bypass conduit connected to the floor duct and the window defrost duct, and configured to direct air from the floor duct to the window defrost duct when the damper is in the floor-only mode position, wherein the conditioned air directed through the bypass conduit exhibits attenuated noise with respect to noise in the mixing chamber as a result of the air being directed from the floor duct and a noise attenuator operatively engaging the bypass conduit for attenuating noise progressing through the bypass conduit.