... equipment etc.1.Performance: low noise, light vibration,strong cooling, muti-role, long life and environmental protection. 2. ... equipment and other machines.3.How to know the cooling fans grade?1.When we choose the fans ... ,not base on the speed, when the cooling efficiency are same, we choose the one with ... pressure. 2.when the air flow reach the cooling demand,we choose the fans with lower speed, ...