... .jmhex.com, you only have to know the tube dimension .Air radiator can be used for air ... : 5mm, 6mm,8mmAlso can be customizationMaterial:Tube :Carbon steel , stainless steel, steel , CopperFin :Aluminum , Stainless steel , Carbon steel , CopperFeatures ... Reference Selection (heat transfer tube diameter 18, fin diameter 38), heat exchanger area square meterSurface tube qtyTube row qtyWidthTube length ...