Description (1) NEW 40 CFM 2800 BTU Stainless Steel Vortex Tube from STREAMTEKTM Corp. (Model No. 7540). For a further description of the listed item and additional photos, visit http://www.stream-tek.com/products/vortextubes/vortex-tube.php What is a Vortex Tube The Vortex Tube is an effective, low-cost solution to a wide variety of industrial spot cooling and process cooling needs. Compressed air is injected into the vortex tube, flows at a rate of up to 1,000,000 RPM towards the hot end of the tube. Once this hot air reaches the end, a small amount is exhausted through a control valve. The rest of the air is forced backwards towards the other end and exits as cold air. The Vortex Tube can decrease temperatures by ~115°F (46°C) and raise temperatures up by ~200°F (93°C) from the initial inlet air temperature. Which Vortex Tube will best suit my needs? Our Vortex Tubes are available in 2 sizes (Small and Medium). Each Vortex Tube is constructed of aluminum or stainless steel. The wear resistance of stainless steel, as well as its resistance to corrosion and oxidation, assures that STREAMTEKTM Vortex Tube will provide years of reliable, maintenance free-operation. HOW IT WORKS: Stainless Steel Vortex Tube (A) Compressed air normally 80 to 100 PSIG (5.5 - 6.9 BAR) enters the Vortex Tube through a standard NPTM inlet and tangentially through a generator into the vortex spin chamber. (B) This air stream spinning at up to 1,000,000 RPM travels in one direction along the small (hot end) tube and then is forced back through the center of this outer vortex. (C) The brass control valve on the hot end allows for quick n easy adjustment of the cold fraction see specifications for what this means. (D) As the center column travels towards the opposite end, it gives off kinetic energy in the form of heat to the outside stream of air and exits the vortex tube as cold air.