Originally Posted by
1/8 IC Fan
Its actually closed, that is where the sensor board sits.
This one is the Performa P1 1/8 Motor
While the first image you posted is the Performa P1 1/8 Radical Motor
The radical version has extra cut out at fin area, claimed to dissipate heat faster.
Would be OK for onroad. But for outdoor offroad track, dirt might get stuck inside the motor