Erwin,
If you do Get-next it would provide you the fan speed for the other slots.
So in the oid 1.3.6.1.4.1.1916.1.1.1.9.1.4.102 - 101 or 102 refers to the slot 1
If you would like to poll the slot 2 then it would 201 or 202 depending upon how many fans in that slot.