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1) Reasonable cone designing which can concentrate blowing and direction, so the air flow is bigger and the fan will be energy-efficient, lower noise. 2) The frame is hot galvanized with advanced auto-machining technique. The thickness of the galvanized layer is 180g/㎡. 3) One fan with 6 stainless steel blades, Model 430BA. Do balance test to make sure the weight of each blade is similar.