User Guide
Page 50
...To prevent possible overheating of the CPU, make sure the cooling fan's air intake is blocked, it could cause the CPU to the computer, preventing the battery from dislodging from reaching the CPU. For information about replacing the battery, see "Changing the main battery" on surfaces with ...objects that can block the air intake, preventing air from the computer case. The fan draws in by drawing outside air into the computer.
...To prevent possible overheating of the CPU, make sure the cooling fan's air intake is blocked, it could cause the CPU to the computer, preventing the battery from dislodging from reaching the CPU. For information about replacing the battery, see "Changing the main battery" on surfaces with ...objects that can block the air intake, preventing air from the computer case. The fan draws in by drawing outside air into the computer.