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 dont have to distinguish between positive and negative poles, just need to supply the ri