140X38MM FANS, HIGH AIRFLOW & EFFICIENCYHIGH PERFORMANCE & LONG LIFESPAN FANSOctominer ventus fans with high static pressure and CFM for increased airflow and optimal cooling performance.Heavy duty ROHS certified plastic blades and housing.Optimized PCB and motor design (Up to 20% more efficient).Improved reliability and heat dissipation due to thick copper PCB.Reliable Japanese NMB double ball bearings for increased lifespan.High precision and efficiency PWM modulation speed control.140X38MM size provides higher airflow and efficiency and also lower noise.