*Hualuo 50-inch glavanized butterfly cone fan is designed to be different from tradional louver shutter of box fan,preventing dust buildup. *galvanized housing ,galvanized cone,(zinc-coat thickness no less than 200g per square meter)and stainless steel blade makes the whole fan more long lasting. *When the fan is wired,air forces butterfly doors to open and boost air output by as much as 15%,greatly improving fan efficiency. *The movement of utterfly doors are controlled by a spring. *Cone is composed of 4-piece panels,easy to assemble. sizediameter of bladecone diameterblade numbersmotor1.38*1.38*0.12m50-inch1.5m6Power-1.1kw(1.5HP) Poles-4 Protection-IP54