High performance PIRANHA fan AIR RIPPER blade design delivers max air pressure massive airflow Features AIR RIPPER blade design max air pressure & massive airflow PWM with SSC technology provides smooth silent operation Hydro Dynamic Bearing extends fan life up to 50000 hours Specification Dimension 120 X 120 X 25mm Bearing HDB (Hydro Dynamic Bearing) Speed 600-1900 RPMMax airflow 7913 CFMSound level 64-272 d B (A) Max static air pressure 304 mm-H2 O Rated voltage 12 V Connector PWM-4pin