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Butterfly Cone Fan 1) Advanced front double- door opening design, small wind resistance, sealing better; 2) Design of the cone brings larger airflow.Bearing Double-row bearingFan blades 430 Krupp stainless steel 1.2 mm thicknessBelt Chinese and Japanese MitsuboshiSupport Hot- dip galvanized support 3 mm thicknessDouble Door Hot Galvanized sheet with zinc thickness of 275g/㎡Motor Chinese and Siemens for choice Protection class: IP55 Insulation class: F