This 20inch MFJ-EW50 Industrial Wall Fan has wide-angle oscillation to refreshing each square foot of your space nicely.The strongest wind can reach 4592 CFM, and it can block flies and barbecue smell easily.This product is renowned for its 100% BLDC Copper Motor,which is High efficiency and Less energy loss，ensuring long-term performance. Even under high temperature or unstable voltage conditions, it can still maintain good and Stable performance.What's more,its Sturdy All-Metal Construction and the Lightweight yet resilient aluminum fan blades guarantee also ensuring durability performance more.So it ideal for heavy-duty use in your place.It’s absolutely a great helper to ventilate your gymnasium,Commercial, Garage, Workshop, Residential, Warehouse,outdoor patios,Greenhouse,resorts, warehouse loading docks and Basement!