"24V DC Cooling Fan" fluid protection system bearing (Hypro Bearing) Its name comes from HY (Hydrodynamic wave, hydrodynamic waves) PRO (Oil protection system, oil guard system), the Department of the well-known manufacturer of radiator and fan design patent ADDA products, "24V DC Cooling Fan" is also in the traditional oil-bearing basis a number of improvements were made. Hydraulic fluid bearing and bearing protection system can be described as the same thing, each of the two designs using some unique measures for improvement, but the essence of the same as the circulating oil system, all aspects of the performance is roughly equal. "24V DC Cooling Fan" is usually the product life of up to 50,000 hours.