Operating instructions RolloTron Comfort DuoFern 1800/1840/1805 Y. Beenen Updated April 04, 2024 20:26 Follow Download PDF Related articles Operating instructions RolloTron Comfort 1700/1740/1705 Operating instructions RolloTron Standard DuoFern 1400/1405/1440 Operating instructions RolloTron Basis DuoFern 1200 Operating instructions Sun/Twilight sensor 3711 What are scenes?