This Three fan unit can be used to cool your cabinet, multimedia center, aquarium, home grow op, brewing project and a wide variety of other systems. These fans move a combined 138 cubic feet (WxHxD) of air per minute (CFM) which is good for 3-6 components (up to 15 cubic feet of space with 3-6 shelves).This is just a general rule of thumb and it assumes you have adequate holes for intake air (if fans are exhausting air outward) and ventilation between shelving. This unit can be mounted on any side of a cabinet (cutout dimensions below). Insert completed cooler assembly in hole and attach with appropriate screws. Fan can be set to be either an intake or exhaust: simply mount the fan to the bracket pointing in the desired direction before installing (the fan will blow toward you if you are looking at the label). What is in the Box: (1) CS 110v AC to 12v DC Power Supply with 4 Pin Molex Adapter(3) Ultra quiet 120mm Fans(1) Black Powder Coated Metal Fan bracket(1) Coolerguys Thermal Controller(3) Black 120mm Honeycomb Mesh Fan Grills(3) Black 120mm Fan Grills(12) Fan nuts and bolts setsOptional Shelf mount bracket for pre-set controller (comes with LED controller) shelf mount bracket(6) #6 - 1/2" black Cabinet screw*Coolerguys Programmable Thermal Fan Controller with LED Display*Bracket for Programmable Thermal Fan Controller (shelf mount)*(3) 3 Pin Sleeved Fan Cable extension 36 inches This is a kit and some assembly is required. THERMOSTAT CONTROLLER Coolerguys Programmable Thermostat Fan Controller with LED Display 24" Thermal Probe4x 3-pin connector portsSwitch between Fahrenheit and CelsiusFully Programmable from 32-211F (0-100C)Handles up to 2A worth of devices DON'T REMOVE PROBE'S PLASTIC PROTECTION CONTROLLER MOUNT Bracket Cutout or External Mounting Option: Controller: 71mm x 40mm x 17mm Cutout: 68mm x 37mmExternal Bracket: 92mm x 60mm AIRFLOW Powerful fan combinations: Single/Double 80mm - 20/40 CFMSingle/Double 92mm - 30/60 CFMSingle/Double/Triple 120mm - 46/92/138 CFM Single 140mm - 68 CFM Fans can be mounted either as intake or exhaust systems. BRACKET MATERIAL Brackets come in Thermal Plastic or Black Powder Coated Steel to satisfy different quality, durability, and appearance requirements. BRACKET CONFIGURATIONS - PRO OPTIONS Assembled Unit Sizes: Single/Dual 80mm: 4.25" x 4.25"/7.87" x 4.25"Single/Dual 92mm: 4.75" x 4.75"/8.87" x 4.75"Single/Dual 120mm: 6.25" x 6.25"/13" x 6.25"Triple 120mm: 17.75" x 6.5" x 1.38"Single 140mm: 7.25" x 7.25" x 1.38" BRACKET CONFIGURATION OPTIONS Assembled Unit Sizes: Single 120mm: 8.50" x 6.50" x 1.38"Double 120mm: 15.10" x 6.25" x 1.38"