Windream Wind Curtains The sole agent in the Kingdom 100% Korean-made wind curtains, ISO certified with a 5-year warranty. Automatic sensor upon opening the door, equipped with 3 speeds, two motors, and a fan speed of up to 2200 RPM. Air pressure provides a 4-meter air barrier to prevent the entry of flies, dust, dirt, insects, humidity, and heat, and to prevent the escape of cool air and the entry of hot air.