"AC Fan" tools preparatory work before installation we can not say more, and other preparatory work by chapter is about the same way, the only difference is directly connected to the wind turbine installation site installation dimensions, as well as reserve installation size requirements is relatively high, the permissible error range is relatively small, foundation dimensions deviation should be within the range of ± 20mm, hollow center of each reserve size deviation should be ± 10mm between, so since we need the fan the size of each extra attention, the error is only installed to a minimum in order to make the fan installation more smoothly.