Heavy duty cooling fan, 140x140x25 mm, 24V, 4-pin PWM, IP67 certified, max. 3000 RPM, max. 41.3 dB(A), >150,000 h MTTF Award-winning 140x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior cooling efficiency 24V, 3000rpm industrialPPC (Protected Performance Cooling) version with 4-pin connector and PWM speed control (1800rpm max. in 12V PC environments) High-speed industrialPPC version for industrial heavy-duty applications that require extreme cooling performance and advanced ingress protection Ruggedised fibre-glass reinforced polyamide construction and IP67 certified water and dust protection