Since the "24V DC Cooling Fan" no long-term cleanup, external also deposited a lot of dust. I first external waterproof AC fans do a simple cleanup. Let's open the waterproof AC fans, there are two small screws on the fan, they screwed down, close the side vents on the loose. Gently break apart "24V DC Cooling Fan" metal snaps, the fan side of the cover can be opened, pay attention not to break apart the snap angle is too large, so as not to lose elasticity, and putting it back in when the card is not tight. Open fan, waterproof AC fans inside is appalling, various clouds of dust, especially on the "24V DC Cooling Fan" of the blades is accumulated a thick layer