20 years experience as a manufacturer of compressed air system products for private label customers and for AIR/TAK distributors.\r\n\r\nAre all refrigerated air dryers the same? \r\nAll have refrigeration circuits, but air/air and air/refrigerant heat exchangers are different. Air/Tak's shell and aluminum finned tube heat exchangers have lowest pressure drop! \r\n\r\nControls and Valves: The Brain and Heart of Regenerative Air Dryers. \r\nAir/Tak uses state-of-the-art solid state control panels (Heatless Regenerative Air Dryers) and Programmable Logic Controllers (Heated Regenerative Air Dryers). Butterfly valves used on all larger model regenerative air dryers.