This is the big ceiling fans that could be used in industrial area, big space, and gyms. The big fans has better ventilation function than air conditioning because it could make the air flows in an un-sealed space.
The people in the space won't feel any uncomfortable caused by lacking of air. And it use very little electricity with very low noise. The diameters are from 2.4 meter to 4.2 meter.
The installation will be explained by a video in English. We have quite a lot customers in U.S. and E.U. and also in China. This big fans could be used almost any big space.