AcFan00210A - 120mm PWM with PST Case Fan for Continuous Operation Perfect Case Fan Regulation with PWM The AcFan00210A is equipped with a PWM function allowing your motherboard to precisely adjust the speed of the fan to the required level. This ensures optimal level of cooling and keeps noise levels to an absolute minimum. Patented PWM Sharing Technology (PST) for Noiseless Operation The patented PST technology allows for several case fans to work together and receive the same signal from the CPU cooler's PWM, ensuring all your fans will spin up if needed and stand down during the low load. This convenient feature makes sure that your AcFan00210A will always operate with maximum efficiency and minimum noise. Innovative Design for Quiet and Efficient Ventilation The unique shape of the fan blades makes the AcFan00210A super efficient in providing the necessary air flow and pressure. This special design together with the advanced PWM feature allows it to run with quiet operation while providing powerful ventilation. Extended Life Span with Japanese Dual Ball Bearing The AcFan00210A is powered by the high quality Japanese dual ball bearing, allowing it to run continuously without compromising performance. This type of bearing is much more resistant to heat and dust than other generic sleeve or one-ball bearings, and supports a life span up to 5 times longer. Two-Way Installation. The AcFan00210A allows for two-way installation to either blow the warm air out of the case or draw cool air into the case.