[MATERIAL]: The blades are made of aluminum alloy<br> [SIZE]: Duct splice ring diameter:8IN<br> [EASY TO USE]: According to the demand, the pipeline can be spliced to form the exhaust and air intake system<br> [ROTATING BLADE]: By adjusting the blade angle, the ventilation flow can be controlled, and it can also be used for wind protection<br> [APPLICATION]: It is used in kitchen, factory, food factory and other areas to form intake pipe or exhaust pipe system