A cabinet includes an enclosure and a fan module. The enclosure includes a first sidewall and a second sidewall opposite to the first sidewall. The fan module includes a bracket, a number of fans mounted to the bracket, a fixing member pivotably connected to a first end of the bracket, and a fixing portion formed on a second end of the bracket opposite to the first end. The fixing member is fixed to the first sidewall of the enclosure. When the bracket is rotated towards the second sidewall of the enclosure, the fixing portion engages with the second sidewall.