Waterproof Cooling Fan had improved

"Waterproof Cooling Fan" is the use of oil-bearing sliding friction sleeve bearings, use of lubricants as a lubricant and DRA. Use over time, due to the oil seal, oil will gradually volatile, and dust will enter the bearings, causing the fan speed slows down, the noise increases and other issues. Many manufacturers are the basis of a number of improvements in order to achieve better results.