This guide will disassemble the fan to clean the fan blades.
Use a Philips #2 screwdriver to unscrew the four 6mm Phillips #0 back screws.
Pull the front and back cover apart.
Remove the Phillips (5-mm head) 6-mm screw that holds the circuit board to the outer shell of the fan.
Remove the top cover containing the circuit board and the wires by pulling it away from the body of the fan.
Remove the circuit board from the top cover. Do not touch the other side of the circuit board as you may damage circuit elements.
Follow steps 1-4 to remove the front, back, and top covers of the fan to reach the fan blades.
Use a cloth to clean off dust clogged in between the fan blades.