Middle Atlantic QBP-2A Quiet Blower Panel (1 Rackspace, Anodized Finish)"The Most Powerful One Space Blower You probably Won't Hear" The QBP 2 is quieter, yet puts out more CFM than other 1 space fan panels. This unit uses a pair of custom designed blowers, in a single rackspace. Features: For smaller rack systems and credenzas where space is at a premium and quiet operation is a must Quiet even at full speed; proportional speed assures the quietest operation possible Low power consumption: blower only runs as needed and