Any machine for use with interchangeable equipment which compresses air, gases or vapours to a pressure higher than the inlet pressure. A compressor comprises the bare compressor itself, the prime mover and any component or device supplied, which is necessary for safe operation of the compressor.
Excluded are the following categories of device:
fans, i.e. devices producing air circulation at a positive pressure of not more than 110 000 pascals
vacuum pumps, i.e. devices or appliances for extracting air from an enclosed space at a pressure not exceeding atmospheric pressure
gas turbine engines.