Round Frame, 105mm Mounting-Hole Spacing, 300 to 1200 rpm Fan Speed, 67.98 CFM Airflow, 19.2 dBA, SSO-Bearing Design, 140mm Cooling Fan, Anti-Vibration Rubber Pads Included, 150,000-Hour Lifespan, Low-Noise Adapter & 4-Pin Y Cable Take advantage of increased airflow and reduced noise with the round-frame brown NF-A15 PWM 140mm Cooling Fan in from Noctua. Using an SSO-bearing design this 140mm cooling fan is designed for reliability and features 105mm mounting-hole spacing. Thanks to a 4-pin PWM connection fan speed can be controlled directly from your motherboard. Delivering 67.98 CFM of airflow at 300 to 1200 rpm and 19.2 dBA this fan also comes with a low-noise adapter that can reduce fan speed to 900 rpm while also reducing operational noise. Anti-vibration rubber pads are also included as is a 4-pin Y cable allowing users to control 2 fans from the same 4-pin motherboard connection. The Noctua NF-A15 PWM has a lifespan of more than 150 000 hours.