How can I add a new fan type from the existing RFXCOM?

[swl2861]

I want to add my Siemens SF01 and I found traces all over the Domoticz cpp files. But I dont really understand why they dont show up in my selection. What must i do to add my Siemens SF01 (extractor hood) fan type to be able to select it in my Domoticz manual switch add menu?