you are right but how to access the 3 screws below the fan blade? can advise further? i tried to pull it off but the fan blade stubbornly stuck to the chassis. i wonder how the assembly of the fan into the chassis work in the first place. if they manage to put the fan in, surely the reverse way will be true. but i can't see any screw or anything that allow me to remove the fan without tearing it apart...