Membrane dryers are dehumidifying dryers that work by depressing the dew point of incoming air. They are popular since they can operate continuously without electricity and are quiet and low-maintenance. No longer relegated to simply point-of-use drying applications, membrane dryers are now available in capacities and efficiencies that rival desiccant dryers without the costly and time-consuming maintenance. They are ideal for applications where the dew point requirement falls somewhere below +32°F (0°C) and -40°F/C.