Because "Waterproof Cooling Fan" no long-term oxygen machine cooling fan cleaning, external also deposited a lot of dust. I first external fan do a simple cleanup. Let us open the oxygen machine cooling fan, there are two small screws on the oxygen machine cooling fan, tighten them down, close the side outlet on loose. Gently break apart oxygen generator cooling fan metal snaps, oxygen side of the cooling fan cover can be opened, note "Waterproof Cooling Fan" Do not break apart snap angle is too large, in order to avoid loss of elasticity in the loading back when the card is not tight. Open the oxygen machine cooling fan, cooling fan inside oxygen is appalling, various clouds of dust, especially on the oxygen machine cooling fan blades is the accumulation of a thick layer. After a simple brush again with a brush ups and downs, I suggest that you use a paper towel or cloth dampened with water carefully wipe the blades again, it is best not to use some organic solvents, because that would easily lead to fan their parents and, in the high-temperature baking under easier to make blades brittle, accelerated aging, water is more reliable. After careful cleaning of patience, "Waterproof Cooling Fan" look. The central axis of the fan after a drop of lubricant before using open approach and then reassembled back on the line. Even to this fan section cleared up.