The ball diameter is 420mm and the throat diameter is 300mm. They are made of stainless steel and the ubc bearings we use are from the usa. We can design other sizes according to your demands. They are mainly used on the residential buildings, villas and the flues to ventilate and change the air. We guarantee the usage of our turbine ventilators for 15 years. The ball diameter is 420mm and the throat diameter is 300mm.
