Patent ID: 7137880

Claim:
A ventilation duct for vehicles, the ventilation duct being for letting out air in a vehicle passenger room to the outside of a vehicle, and comprising: a duct body disposed in a vehicle outer hull and comprising a frame having a ventilation opening opened to the outside of a vehicle and a valve element covering the ventilation opening openably and closably; a conduit formed integrally with or independently of the duct body, wherein the conduit is disposed on a vehicle-passenger-room side of the duct body, communicated with the ventilation opening of the duct body and communicated with the inside of a vehicle passenger room, enabling air inside and outside the vehicle to pass therethrough back and forth; a sound absorption chamber; a transmission opening communicating the conduit with the sound absorption chamber; an air-permeable member closing the transmission opening permeably; and a housing disposed on a vehicle-passenger-room side of the duct body, wherein the housing is formed independently of the duct body and is provided with the conduit, the sound absorption chamber, and the transmission opening and the air-permeable member, wherein: the housing comprises an opposite wall facing the ventilation opening of the duct body and having a recess demarcating the sound absorption chamber; and the air-permeable member is disposed so as to cover the recess of the housing.