dash95 wrote:It's an air-gun attachment for a compressor or an air tank. Basically just blows air.
Consider this to be like a Dyson Fan for your air compressor. The low-volume but high velocity air flow pulls along other nearby air, and shoots the whole mass out the end. It allows your compressor to be much more effective at moving more air, which makes it better for dusting and blowing stuff around.
This also makes them good for inflating large air mattresses and toys.
Lastly, because they're actually open to the air on the back, it is harder to give yourself an embolism. They're marginally safer to use than a straight blower nozzle.