Patent ID: 7707711

Claim:
A method for acoustic noise reduction in a system, comprising: providing an enclosure for containing components of the system, the enclosure including a front panel, a rear panel, a top panel, a bottom panel, and two side panels; providing a vented cover positioned relative to the enclosure so that the vented cover abuts against a selected one of the panels having an airflow aperture, the vented cover including a pair of cross-flow ventilation ducts, wherein one of the cross-flow ventilation ducts crosses the other of the cross-flow ventilation ducts so that in an intermediate cross-section of the vented cover air moves in one of the cross-flow ventilation ducts in a direction substantially opposite to that in the other of the cross-flow ventilation ducts, and wherein at least a portion of each of the cross-flow ventilation ducts includes an acoustic noise reduction lining; causing external air to enter the enclosure and then exit the enclosure, wherein the external air enters the enclosure or exits the enclosure through the cross-flow ventilation ducts of the vented cover.