All the models have coated aluminum frames. The standard coil is made of copper piping and aluminum fins. There is also the option of Here site coated coils or copper fins, for better resistance to corrosion.
The inner surface of the pipes has a special pattern that, through increased turbulence, allows greater heat exchange at the same airflow. The fans, therefore, consume less energy and produce less noise.
Thanks to special coil supports, there is no contact between the pipes and the frame. This eliminates the risk of breaking the sealed circuit thus improving the durability of the product.