The Greenwood Airvac CV2GIP Unity 100mm dMEV Fan is a smart extractor fan designed for improving air quality in any room. With a round shape and 4-inch diameter, this electric fan operates quietly with a low 10 dB sound rating. Made of white plastic, it features a programmable timer and energy-efficient design rated A for energy efficiency. Perfect for continuous ventilation, this unit from the United Kingdom is a reliable choice for maintaining a healthy indoor environment.