近年来，作为实心门的替代品，气帘门的接受度越来越高。气帘门是以规定的速度和角度吹过开口的气流或气流组合，从而大大减少结构内外空气的自然循环。图1显示了再循环单喷气式飞机气幕的示意图。除了在门口起到隔热和防潮的作用外，许多空气幕的设计还可以限制昆虫、灰尘和侧风的渗透。 气帘门的性能受许多变量的影响，包括喷流的数量、气帘门的厚度、门道的宽度、门道的高度、喷流速度、初始喷流湍流水平以及喷流中的压力和温差。出于节能考虑，需要将受控环境和周围环境之间的气流最小化。与开放式门口相比，气帘门提供了必要的气流限制，同时保持了最佳的交通流量。然而，必须找到气幕变量的最佳设计值，以确保气幕的密封能力，同时最大限度地减少热量、水分和污染物的传递。 引文:ASHRAE交易，第82卷，第2部分，华盛顿州西雅图

Air curtain doors have found increasing acc,eptance in recent years as replacements for solid doors. An air curtain door is a stream or a combination of streams of air blowing across an opening at a specified velocity and angle such that it greatly reduces natural circulation of the air between the inside and the outside of the structure. A schematic diagram of a recirculated single jet plane air curtain is shown in Fig. 1. In addition to acting as a barrier for heat and moisture at a doorway, many air curtains are also designed so as to restrict the penetration of insects, dirt, and cross winds. The performance of an air curtain door is affected by many variables, including the number of jets, thickness of the air door, width of the doorway, heighth of the doorway, jet velocity, initial jet turbulence level, and the pressure and temperature difference across the jet. Energy conservation considerations require the minimization of air' flow between the controlled environment and the surroundings.When compared to an open doorway, the air curtain door provides the necessary restriction to air flow while maintaining optimum traffic flow. However, optimum design values for the, air curtain variables must be found in order to assure the sealing power of the air curtain while minimizing the transfer of heat, moisture, and contaminants.