Cool Components CP-CC-4FN Heavy amplifiers and receivers can be placed directly on top of these units or you can stack them between components. These units feature top-quality 92mm levitation fans and blowers that are mounted using a special vibration damping system which eliminates noise caused by fan vibration and also facilitates changing the direction of the airflow. The units operate on DC voltage and by adjusting the voltage, the unit can be run quietly or more aggressively, depending on the application. These units are ideal for directly cooling amplifiers and receivers installed in cabinetry or rack systems. All versions come with rack mounting hardware, as well as rubber feet for stacking applications. The 4 Fan version is more aggressive than other full sized units and, as with the other versions, the fans are easily reversed which separates them from the others. This way you can very aggressively move air upwards or downwards which means that whether you set a component on top of this cooler, or the cooler on top of the component, you can easily direct air away from the component. Features: -Includes power supply.-Includes 4 - 92mm fans.-Universal applications: Rack mountable or stack between components (rack mount ears included).-Does not include RF1BLK face plate.-Usually used with high powered amplifiers, receivers, to vent or cool entire systems.-Draws air from the bottom of the unit and exhaust through the top.-Utilizes specially manufactured 92mm levitation (Brushless & Vapo Bearings) fans for longer life (Estimated 50,000 hours).-Fans mounted using specialty mounting system to absorb fan vibration for quieter operation.-Fans easily reversible for directing air upward or downward depending on the application.-Uses variable voltage power supply to adjust fan speed and compatible with temperature.-Controllers - TC-BSC, TC-ALT and TC-AC (Note: TC-AC is not recommended for the CP-CC-FL).-Air Flow: ~65-130CFM/ ~120-260CFM/ ~120-260CFM/ ~135-278CFM.-Noise: Dependent on settings (Can be run quietly).-Power Connection: 2.1mm Coax Connector w/ 2-Pin Fast Wire System (Ensure proper polarity).-Construction: Heavy gauge steel (painted black).-Color: Black.-Product Type: Accessories.-Country of Manufacture: United States.Specifications: -Voltage: 7 to 9V DC for normal operation or 9 to 12V for more aggressive cooling.-Current: 400mA / 800mA / 960mA at 12V DC.Dimensions: -Compact: 1 rack unit (1RU).-Without Feet: 1.7'' H x 17'' W x 13.4'' D.-Overall Height - Top to Bottom: 2.25.-Overall Width - Side to Side: 17.-Overall Depth - Front to Back: 13.4.