Heavy duty cooling fan, 140x140x25 mm, 24V, 4-pin PWM, IP67 certified, max. 2000 RPM, max. 31.5 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, 2000rpm industrialPPC (Protected Performance Cooling) version with 4-pin connector and PWM speed control (1100rpm 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