Because the use of different environments, we choose "AC Fan" types, plus the installation of wind turbines there are many, but we need to pay more attention in the installation, for centrifugal fan, it is usually some widely used in warehouses, workshops in other places, such places on the fan mounted balance have certain requirements, in order to install the centrifugal fan, the fan base and the bearing can not be ignored. Install bearing housing and the base is to refer to some of the most important installation data, as long as we keep the installation within this range, and that the balance and stability of the installation can be well protected. Usually mounted vertically level can not exceed 0.2 / 1000, on the measuring spindle with a spirit level, horizontal level at the end should not exceed 0.3 / 1000, the level of the equatorial plane bearing measured in a horizontal instrument. This value directly affects the effect the fan, so we need extra attention.