Versatile 120mm Blower FanElectronic 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 ConsumptionEC 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 Blowers1.5-3 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 UpAir 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 dont have to distinguish between positive and nega