1.Optimization by CAD/CAM 2.Guaranteed quality 3.Fine performance 4.Good price 5.Satisfactory ... installation and removel.8.Fan is subject to eight strict quality testing procedures——noise, vibration, dynamic balance, static balance, ... speed, overall efficiency test prior to shipment.9.High quality motor, whose voltage can be 380V or 220V, can ... , etc. fan pad cooling system for poultry and greenhouse