Cross Screwdriver / 2.5mm Allen Key / Diagonal Pliers / Ribbon
1. Screw off eight bolts on the back cover by 2.5mm Allen key and take the cover down.
2. Anticlockwise screw off the HEPA filter cover.
3. Take down the HEPA filter (The grid should be outward), and screw off two bolts by cross screwdriver.
4. Cut the ribbon on the centrifugal fan by diagonal pliers, and pull the plug from mainboard to take the fan down.