| 摘要 |
An air inlet duct for a heating, ventilating and air conditioning system, the inlet duct comprising a housing 1 having an air outlet 2, an outside air inlet 3, a recirculation air inlet 4, and a valve means 5, said valve means 5 being selectively operable to place the outlet 2 in fluid communication with the outside air inlet 3, the recirculation air inlet 4 or both, wherein the recirculation air inlet 4 is provided with air flow guide means for directing the flow of air movement through the recirculation air Inlet 4, wherein the guide means preferably comprises a plurality of vanes or louvres 7 for guiding the flow of air passing thereover.
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