A solid cone nozzle comprises a nozzle housing and a swirl insert, wherein said nozzle housing has an outlet chamber including a discharge orifice and wherein the outlet chamber is disposed downstream of the swirl insert. A latch is positioned inside this latch slot, for example with the aid of a rivet. The fixing frame has a fan at a position opposite to the motherboard and the storage device, so that the airflow direction of the fan is parallel to the interface cards. The invention is designed to not only be resilient to faults, but also allows for the system maintenance, modification, and growth\u2014without downtime.