GEOMETRIES Thermokey’s concept is to satisfy any type of application. A broad array of geometries are therefore available: - 25x21,65mm with 3/8” or 5/16” tube - 30x25,98mm with ½” or 3/8” tube - 50x43,3mm with ½” or 5/8” tube - 42x36,4mm with ½” or 5/8” tube FINS The fins can be supplied in aluminium, copper, tinned copper, prepainted aluminium, double coated or in stainless steel AISI 304; they are provided of spacing rings, these guarantee a perfect fin spacing and contact with the expanded tubes. A special high efficiency corrugated fin is used for a higher performance if compared to normal corrugated fins; a special extra high efficiency louvered fin is also available.