What is EC technology?
EC stands for Electronically Commutated and it combines AC and DC voltages, bringing the best of both technologies
The motor runs on a DC voltage, but with a normal AC supply.
DC motors already have low power consumption but if used in an AC application
The power needed converting AC to DC, using a bulky, inefficient transformer.
The EC motor incorporates voltage transformation within the motor.
The non-rotating part of the motor (stator) is extended to make room for an electronic PCB board which includes power transformation AC to DC, as well as the controls.

Specification
Rated Voltage: 90-270V
Power: 4.0 Watt
Speed: 2200 ±10%RPM
Air Flow: 24.6 ±10%CFM
Noise: 42±10%dBA
Cable Length: 200mm (7.87inchs)
Weight: 210g/pcs

Package include:
1 Piece fan include fan grill and mounting screws & nuts
2* leadwires（about 38 inches).
1* Power Plug
【Versatile 120mm Blower Fan】Electronic Commutation (EC) fan design, Works on 120V and 240V; Ventilate for various DIY projects, Transfer heating/cooling for heater, Circulate air around refrigerator, Exhaust odors, cool AV closets
【Low Energy Consumption】EC Centrifugal Blowers run on high efficiency brushless DC motors which are driven directly from an AC power supply; 80% Power Consumption Reduction compared with standard AC-powered Axial fans and shade pole motors
【Small but Powerful EC Blowers】1.5-3 times air volume compare to the same AC fan; Durable centrifugal blades & ball bearing ec motor; Reliable operation even at high temperatures; ＞50,000hrs lifespan; Compact design thanks to external rotor motor
【Easy to Set Up】Air Outlet: 2.4 x 1.26 in. | Blower Size: 4.7 x 4.7 x 1 in. | Airflow: 24 CFM | 2200 RPM | 4 Watts | 80V to 240VAC ~ 50/60Hz | Noise: 39.6dB; When installed, ec fan don’t have to distinguish between positive and negative poles, just need to supply the right voltage
【Buy Worry-free】Every EC centrifugal blower fan comes with a 12-month warranty from the purchase date; Please don't hesitate to contact us if there is any question, customer support team will reply to you within 24 hours
【What's In the Box】The 5 Inches EC Centrifugal Blower Fan×1; 4.9 Feet AC Power Cord×1; White Spring Clip×1; Screw Nuts×3; The EC Axial Fan User Manual×1;