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White Air Curtain is a device used to create an invisible barrier of air across doorways, windows, or openings to maintain an effective separation between different environments, typically indoors and outdoors. The primary function of an air curtain is to prevent the transfer of air, dust, insects, pollutants, and even heat between spaces, all while maintaining a comfortable environment inside. The "white" in its name usually refers to the color of the device, which may be chosen to blend seamlessly with interior décor.