Exhaust fan 20W, with exhaust capacity of 150m ³ / h and the line diameter of 100mm. If you dont have windows in every environment already there is a solution, exhaust fan enrich the environment with fresh air and will remove bad odors and steame. Can be installed with a fin design, and quiet during work with different sections. You do not need to intervene in the discharge lines, there is a wide range of inline diameters sections, you just have to choose the wright one.