Dunli ventilating fan is widely used in condenser,evaporator and other refrigeration equipment and ventilating cycle areas.Dunli fans with external rotor motor drive offers features such as space saving, compact and attractive design. The motor is fitted within the impeller, which enables the best possible cooling. 100% speed infinitely controllable external rotor motors have extremely low starting currents, the motors can apply to protection class IP54. The windings comply to insulation class B and F., with thermal protector in motor windings as standard for motor protection. The fan can work with ambient temperature from -30 up to 60. we can product by your special request. Leading technology, quality service, and high sense of responsibility on energy and environment have made Dunli a pioneer in the industry. It provides its customers from around the world with full line HVAC products of high efficiency, environmental stewardship, and comfort and systematical solutions.