What is Air door?
{{no sources|date=May 2023}} An '''air door''' or '''air curtain''' is a machine used for separating two spaces from each other. The machine is mainly used at doors into buildings. The most common setup for [[air]] [[curtain]]s is a downward-facing [[blower]] [[fan (mechanical)|fan]] placed over an opening. Normally this opening is a door to a building. The fan stops outside air from entering the building to keep the building warm or cool. The air curtain also keeps [[insect]]s out by making [[turbulence]]. The fan must be powerful enough to generate a jet of air that can reach the [[floor]]. They can also be heated or cooled as well to provide space heating or space cooling to an area. {{HVAC}} {{Tech-stub}} {{DEFAULTSORT:Air Door}} [[Category:Temperature]] [[Category:Heat transfer]] [[Category:HVAC]]