Large-scale industrial ceiling fans like HVLS Fans and PMSM Fans have large exhaust volume and wide coverage. There are many differences between industrial ceiling fans and ceiling fans for domestic applications. First, there is a huge difference in body size. Secondly, the industrial ceiling fan adopts the variable cross-section streamlined design to make its coverage rate large, because this type of design can reduce the frictional resistance in the air http://www.rtfansgroup.com/hvls-fans/pmsm-fans/