If you encounter problems before purchase or installation, please contact me in time, I will be happy to solve the problem for you. Product name: case fan Size: 140*140*25mm Rated voltage: 8-13.2V Rated current: 0.22- 0.28A Fan speed: 1000-1 800RPM Noise level: Max 30.5dBA 10% Air volume: Max 78 CFM Bearing: hydraulic bearing Pressure-optimised blade design with outstanding quietness of operation.