When compared to blower systems enhanced compressed air cooling systems are very easy to maintain. Whether the system is comprised of air nozzles, air amplifiers, air jets or air knives there are no moving parts involved and no external power is required. This means that there is virtually nothing to go wrong with the blow off system. Similarly, vortex tube powered coolers have no external power source or moving parts are so are equally reliable and maintenance free.
The simplicity of these systems means they can be deployed in areas that would preclude the deployment of powered blowers. In dirty, wet or humid areas of the production facility any powered equipment requires often costly protection to prevent it breaking down. This may involve water proofing or additional filtration / dust protection. Compressed air systems require none of this and so, in such environments, they are intrinsically more reliable.