Model GDF Series Rectangular Centrifugal Duct Fans are forward-curved multi-blade centrifugal ventilation fans. They feature excellent performance, stable operation and low noise. Under identical air volume and wind pressure conditions, their noise level is 15 to 20 dB(A) lower than that of axial flow fans. With a compact structure and easy installation, these rectangular fans can be directly connected to air ducts, and are widely applicable to air supply and exhaust ventilation systems in various scenarios.