In commercial buildings open to the public, limiting the leakage of conditioned air into the street helps reduce climatisation costs. You can form an airlock with two automatic doors, but this only works with moderate traffic when one door is open at the time. Another older solution is the revolving door, where the air is trapped in the wedge between two door panels, but people must weave within the wedge to enter. This variant of the revolving door aims to improve the flow of trafic while keeping the air-trapping capability.