What factors Waterproof Cooling Fan play a decisive role in the speed of

Many customers buy "Waterproof Cooling Fan" when are the first thing to consider is cooling fan manufacturer qualification, quality of products, product size, and finally whether the product have had heat performance, but on the "Waterproof Cooling Fan "the decisive factor in the speed and what it? Axial fan speed and cooling capacity and not necessarily related to higher "Waterproof Cooling Fan" speed it will lead to higher noise, if the amount of wind almost, you can choose a low fan speed cooling fan when purchasing products in use when will quiet some