That appears to run off an air compressor. Machines that run like that are generally for the pickup of flammable or explosive materials that could be ignited by the heat/electricity of a standard motor.
These were often service station vacs as they had convenient air hoses.I have seen them used outside with long hose on exhaust to blow the dust/dirt away from car interior and back to outside air as some now do 'sweeping' sidewalks with blowers.