Box fan
1. When running, the opening mechanism drives the shutters to open completely, with a small wind resistance and stable operation;
2. Imported belt is used, which has strong tensile strength; （Both brands ship at random）
3. The hot-dip galvanized sheet that meets the requirements of national standard (GB/T 2518-2008) is used, with a galvanized layer of 275 g/m2, and strong corrosion resistance;
4. The fan blade is made of 430 stainless steel, with smooth surface and without accumulated dust;
5. Flange plates are widened to improve the strength;
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