The heat sink and fan (HSF) unit that AMK Services sent us is called the GlobalWin WBK55. It is the exact same heat sink as the GlobalWin WBK38, except it is fitted with a 92 mm 55 cubic feet per minute (CFM) fan. If you check out GlobalWin´s website, you will not see this HSF combo listed on their page. The reason for this is that AMK has put together their own heat sink and fan combo coupling the GlobalWin WBK heat sink with a Sanyo Denki 92mm fan.