... breeze is not less than 0.2m/s and teh indoor and outdoor termperature difference exceeds 0.5 .In ... guaranteed quality.Solid spherical structure and permanently lubricated upper and lower ball bearings combine the need for maintenance and parts replacement.Aonuodi roof ... factories,warehouses,villas,patio,greenhouses,livestock houses,mining tunnels,and more.Typically ,it is used in the flowing ...