A breathing air blower made by Allegro industries, model number 9815-EF. It's designed to provide fresh air supply for one or two people in settings where air quality may be unhealthy - this one came out of an airbrushing studio, as an example. All sorts of workshop/art studio applications. This unit is being sold untested, because we don't have the breathing equipment to assess its function. It looks like one of the wires in the power supply may need to be reconnected, price reflects this and the untested state. This model sells for $417+ online.