Future: Waterproof grade IPX2. Made of high quality metal matrial,durable,easy to clean. 7 fan blade exhausted fast and strong. Low motor power has overheat protection Suitable for ceiling mouting or fixing on wall Metal Protection Net The protrective net is made of high-quality metal material with glossy surface, anti-corrosion and scratch-proof to prevent inhalation of foreign materials. Metal Fan Blades & Strong Wind Improved metal blades and large wind design can achieve strong airflow, effectively reduce heat generation and achieve the best cooling effect. Pure Copper Ball Motor The motor adopts sealed pure copper bearing with thermal protection and permanent lubrication, low heat generation, long running time and long service life. Automatic Valve The valve can be opened and closed with the operation of the fan to prevent mosquitoes and mice. Screw Fixing Net The net cover is fixed by four screws,Which is more secure, safer and more secure to use.