This RA-EC17251A fan design delivers the combined benefits of AC and DC Fans. Its has same size like series Dc fan. The EC fan's power comes from a brushless DC motor, but it offers the control that AC induction fans have over the fan rotor through a printed circuit board. The Ec fan are Widely-used in any place which can not provide DC, or same size AC products doesnt has enough performance. The product series is RoHS compliant and is also certified according to many quality management accreditation systems and has gained various accreditations such as UL TUV and VDE. Every model undergoes rigorous testing to achieve minimum noise under high airflow and air pressure conditions. All models are meet strict reliability requirements.