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Item Features The quiet duct fan system contains an AC-motor with speed-control for a quiet and energy efficient performance. It enables the duct fan to be able to run smoothly at extremely low RPM speeds without generating additional heat or noise. Variable speed controller for easy fan speed adjustment. This means it will help prevent damage to fan motors, ensuring longer life. Lightweight Plastic fan is easy to install. The motor box containing the fan's impeller and blades can be detached from the mounted frame for easy cleaning and maintenance. The unit is IP44 rated to be highly resistant to dust and liquids, and performs well even in harsh environments.This fan is not suitable for fireplace or furnace applications. Applications This HVAC duct fan system is popular in a variety of applications including cooling AV equipment rooms, closets, racks, and cabinets. It is also used in various air circulation and ventilation projects including hydroponic grow rooms and tents, exhausting bathrooms and attics, and other installations. Specifications Diameter: 4 inchVoltage: 110VFrequency: 60HzPower: 60WCurrent: 0.85ASpeed: 2400 RPMAir Flow: 200 CFM