Pc case fan be quiet! silent wings 4 pwm, 140x140x25 mm, 13.6db, 51.3 cfm, 1100rpm, 7 blades, fluid-dynamic bearing, pwm, 4pin, black . model silent wings 4 140mm pwm dimensions (mm) 140 color option black fan speed at 100% pwm / 12v (rpm) 1100 noise level at 100% pwm / 12v (db(a)) 13.6 airflow at 100% pwm / 12v (cfm / m3/h) 51.3 / 87.2 air pressure at 100% pwm / 12v (mm h2o) 0.92 dimensions (l x w x h), (mm) 140 x 25 x 140 weight incl. fixed cables (g) 220 bearing technology fdb motor technology 6-pole fan motor push pin fixing %3f screw fixing %3f connector 4-pin pwm cable length (mm) 500 cable sleeve %3f airflow at 100% pwm / 12v (cfm / m3/h) 51.3 / 87.2 air pressure at 100% pwm / 12v (mm h2o) 0.92 noise level at 100% pwm / 12v (db(a)) 13.6 lifespan (h / 25°c) 300,000 zero rpm mode %3f