... www.jmhex.com, you only have to know the tube dimension .Air radiator can be used for air to ... 4mm ,Finned plate distance : 5mm, 6mm,8mmAlso can be customizationMaterial:Tube :Carbon steel , stainless steel, steel , CopperFin :Aluminum , Stainless steel ... , cooling , humidifying and so on .Reference Selection (heat transfer tube diameter 18, fin diameter 38), heat exchanger area square meterSurface ...