See picture, that is not a fan but a motor.
Have you seen/noticed when you first turn the P3 on the camera goes from right/left to centre very slowly or when you first arm the motors before take off the camera moves towards a side before centering?
Its that motor that moves it.
Thanks for that. I've often wondered.
So, if it looks like a fan, works like a fan don't be fooled, it could be a gimbal motor.