Description Do you want a kind of professional cooling fan for your server rack? Do you want to keep your server operating smoothly? This can be your best choice. Really practical and useful, just install it onto your server. Features -Color:Black -Material:ABS -Size:12.00X12.00X2.50cm/ 4.72X4.72X0.98in - Ultra-long service life, with large air volume and air pressure, great heat dissipation. - Large air volume fan blades, creative and scientific design, give you a good experience. - Maintenance-free double ball bearings, long service life, with sufficient heat dissipation air volume and air pressure. - Replace your old or broken ball bearing cooling fan with a new one. - It has a simple design, but very practical in use, giving you a good using experience. Specification Power supply: large 4PIN male and female interface, support multiple fans in series Voltage: DC 12V Current: 0.5A Speed: 3000RPM Air volume: 154.5CFM Noise: about 55dB-A Bearing: High precision double ball bearing Fan rotation direction: counterclockwise when viewed from the direction of the fan blades Operating temperature: -10 degrees Celsius to +70 degrees Celsius Storage temperature: -40 degrees Celsius to +70 degrees Celsius Power supply range: plus or minus 15% of rated power supply Insulation resistance: greater than 500 megohms Withstand voltage: sink leakage current 0.5mA 500V/1 minute Working life: 80,000 hours at ambient temperature of 25 degreesPackage list: 1 x computer fan