Their are vents on opposite side of laptop, my guess its su king air in on that side ,air moves over other hot components then out cpu exhaust.
This is a horrible design, and I'm going to not drill holes in case it faults other devices inside. So I'm going to try a cooling tray
Its a cheap laptop I paid $25 for so wife stay off mine, only needed new keyboard and DVD drive. May upgrade thermal paste for he'll of it.