Operating instructions Troll Comfort DuoFern 5665 Y. Beenen Updated April 01, 2024 11:53 Follow Download PDF Related articles Operating instructions Troll Basic DuoFern 5615 Information about the Troll Comfort DuoFern 5665 Which remote controls can be used to operate the Troll Comfort DuoFern? Operating instructions Speedtimer Can the Troll Comfort DuoFern be used as a central control unit?