IOLITE-R12 allows changing the fan speed in the DewesoftX. Settings are possible for IOLITE-R12 devices that have fans integrated. This feature is supported from DewesoftX 2021.5 onward. Configuring the fan's speed is supported for all IOLITE slices with the firmware at least ##DewesoftFWPack_2021-07-27. The table below represents the options and values of the fan controller behind the chosen setting.
| Settings in DewesoftX | Duty cycle of fan [%] |
| Minimum | 10 |
| Default | 50 |
| Maximum | 100 |
| Custom | between 0 and 100 |