... 14" 16" 20" 24" 2.elegant chic,good performance 3.corrosion prevention,durable 4.large wind,low noise 5 ... -temperature protection, low temperature rise, low power consumption, good insulation, long life operation.Structural components using high-quality ... spinning, good rigidity, high strength, beautiful appearance, easy installation. CAD design, rigorous testing of the electrical performance and air ...