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Frame made from hot galvanized steel sheets in order to assure highest strength and strong resistance to corrosionProtective Net Made of hot galvanized wire,Can prevent accidental touch inside.Shutter Made from hot galvanized steel sheets，Can be opened by the ariflow of the fan.Motor China famous brand motors, IP 55, Class F, high stability, long service life 100% Copper Wire.Bearing Double row bearing DAC00600037, water proof, high intensity, low noise, long service life.Blade Stainless steel, passed the experiment of dynamic balance , big air volume, without deformation, no breaking.Swung Hammer With nylon swung drop hammer, ensure shutters open and close automaticly and flexibly.The belt Chinese belt and Japanese three star brand belt for customers to choose.Long service life,Handle Convenient for loading and unloading, installation. Save labor.