After years of unremitting efforts, "Waterproof Cooling Fan" using advanced resin sealing technology, successfully developed a long-term fan of DC waterproof work underwater. Waterproof rating really achieve IP68. All along, waterproof function has been a technical problem axial brush less fan facing many manufacturers. People in the first period, "Waterproof Cooling Fan" with high concentrations of varnish on the motor for soaking. After the varnish completely into the motor gap, and then dried in an oven. This motor jelly-like layer formed on the surface of the protective layer, but the density of the protective layer is not big enough. Because of its structure is soft, easy to scratch hard objects outside. So a lot of water when the fan motor assembly has lost its waterproof function. Also varnish water can slow decomposition, they simply can not be in contact with the fluid water molecules. The process can only work for mild wet conditions. And "Waterproof Cooling Fan" actual results are not satisfactory.