Coolerguys Programmable Thermal Controlled Cooling Kits for Cabinets, AV, and Components (Metal, Single 80mm)

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 92 cubic feet (WxHxD) of air per minute (CFM) which is good for 2-3 components (up to 30 cubic feet of space with 2-3 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).