Sustainable and efficient air extraction The Mark MDV BLUE roof fan is suitable for extracting air from buildings and features the latest developments in the field of fans, including the efficient EC technology. This guarantees a very low power consumption combined with excellent performance. The MDV BLUE roof fan is available in various sizes and air displacements varying from 300 m /h to 15.000 m /h. The unit is supplied with a radial fan. The casing is made of sendzimir plate. The MDV BLUE can be used in factories, welding areas, offices and supermarkets. Optional Aluminum casing seawater resistant AlMg3 Controls: i.a. constant pressure, 0-10V, presence control, CO2 control, humidity control and temperature control.