In tackling your casersquos cooling needs there is no lsquoone fan fits allrsquo each of the two 140mm fans in the masterfan pro series provides a specific air cooling solution while all being fitted with multiple layers of our exclusive noise reduction technology and adjustable speed profiles put together they work in harmony to cool your entire case and its components air flow fans are ideal for exhausting large volumes of air quickly out of the case we recommend them for use on the rear