Arenas, convention centers, and other large, high-capacity, multiuse buildings present a number of challenges from the standpoint of air infiltration through open doors — some of which can be addressed using air curtains. An air curtain is a fan or a system of fans located inside a cabinet that blows a controlled stream of air across a door or window opening, creating an air seal. This air seal separates environments while still allowing a smooth, uninterrupted flow of pedestrian traffic. An air curtain saves energy by containing heated or conditioned air, increases comfort by preventing the infiltration of flying insects and other contaminants, improves safety by drying floors at entranceways during inclement weather, conserves space and costs by replacing vestibules where allowed by building energy codes, and more.