Premium quiet fan, 140x140x25 mm, 12V, 4-pin PWM, max. 1500 RPM, max. 24.6 dB(A), >150,000 h MTTF Award-winning 140x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance Square frame design is ideal for water cooling radiators (AIO or DIY), PC cases and other chassis (intake & exhaust), cabinet ventilation, etc.