The Monsoon UMD100T 100mm inline fan with timer is a white, round-shaped electric extractor fan designed for use in attics. With a diameter of 4 inches and a glossy finish, this unit is energy-efficient and has an energy efficiency rating of A. Its features include a timer function, making it ideal for use in bathrooms and other areas requiring improved air quality and ventilation. The fan from Monsoon is a reliable choice for those looking to enhance the circulation of air in their home.