FDD25-15S1 is a Chinfa fan featuring a curved-blade forward-curved fan wheel design. The high-efficiency impeller design provides maximum performance and durability with low-noise operation. The fan features an external rotor motor design that enables high performance and ease of maintenance. With an exterior diameter of 25 inches, the fan delivers airflow of up to 11,700 CFM at an operating speed of 1,400 RPM. The fan is available with a variety of accessories, including guards, bells, shutters, and protection grids, making it suitable for use in a variety of applications.