The Nex Flow Stainless Steel Vortex Tubes are available in a 3 sizes to meet the needs of many process and spot cooling applications. Using Factory compressed air Our Vortex Tube convert into two air streams. One stream is hot air and the other stream is cold air. The advantage of our vortex tube is that it has no moving parts, which translates into no maintenance. The cold air can be adjusted down to -46 degrees Fahrenheit, and the hot side can be adjusted up to a temperature of 250 degrees Fahrenheit.