This two 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 40 cubic feet (WxHxD) of air per minute (CFM) which is good for 2-4 components (up to 120 cubic feet of space with 1-3 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) Cabinet fan faceplate: available in metal or thermal plastic(2) Coolerguys Dual Ball Bearing 80mm 3pin 12v Fan: 30" (760mm) long cord, 17 dB, 20 CFM(1) Coolerguys Programmable Thermal Controller with LED Temperature Display: a 24" (610mm) probe, (4) 3pin fan connector ports (12v only)--can handle more with the appropriate splitters (maximum 1.5A) (1) Coolerguys 100-240V AC To 12V & 5V DC Power Supply With 4pin Molex(4) Black 80mm Fan Grill (1) Shelf mount bracket for controller(16) Fan nuts and bolts (4) #6 - 1/2" black Cabinet screw 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"