Konuk Isı air-cooled heat exchangers are designed for severe service; each part is reviewed by engineering, welding and quality staff. The package comprises finned-tube bundles, fan stacks, driven axial fans and a steel structure; walkways and louvers can be added. L-fin wraps an aluminium strip in an L shape onto the tube, with a maximum operating temperature of 150 °C. Extruded B-fin aluminium tubes are rated to 300 °C and embedded G-fin to 400 °C. Welded bonnet headers have a maximum design pressure of about 100 bar; removable-cover headers allow cleaning and maintenance. Aluminium fins are light and corrosion resistant; galvanized steel tubes add mechanical toughness.