How to choose the Waterproof Cooling Fan?

Chassis whether hot summer heat you tortured? We tend to talk about chassis cooling duct say most is, "Waterproof Cooling Fan" duct helps better heat dissipation within the chassis hardware, so support is the fan duct. "Waterproof Cooling Fan" is the core chassis cooling, the user at the time of purchase fans are most concerned about two things simply means that the size of the amount of wind noise size. We are concerned about more than just these two points in the heat, how to choose the right "Waterproof Cooling Fan" or how to choose Help chassis cooling fan is a lot of players never thought a headache or problems. Today, we are concerned that the fan inside the chassis in the end how to choose?