Depending on the cooling load of the air conditioner, there is also a supply air temperature difference.
Spiral air ducts were first used in ventilation and cooling, so they are classified into the air duct category. This is a name given based on its purpose, but it can be used in other places, even for drainage, liquid discharge or as a container. This cannot be called an air duct. According to the structure, it should be called spiral seam thin-walled pipe. Because it is mainly made of metal, it is also called spiral seam metal pipe. If it is named according to the material classification, it can probably have the following names: galvanized (iron) spiral pipe, stainless steel spiral pipe, aluminum spiral pipe, or in order to distinguish it from the existing stainless steel pipe, it can be called ultra-thin stainless steel pipe, because It can be rolled from stainless steel strips of 0.3 mm or even thinner.