Old technology. You can buy a range of such things from industrial suppliers like McMaster. http://www.mcmaster.com/#air-amplifiers/=41ls8s http://www.mcmaster.

Old technology. You can buy a range of such things from industrial suppliers like McMaster. http://www.mcmaster.com/#air-amplifiers/=41ls8s http://www.mcmaster.com/#air-amplifiers/=41ls8s. They tend to be loud and inefficient, but useful in dirty environments where fan blades would get damaged.