57 / 68 specifications #17/18 s 57 r a u m l u f t u n a b h ä n g i g g e p r ü f t tm tm smartcontrol tm all drawings: the measurements for the flue outlet and fresh air connection have been given to the centre of the hole. variants autopilot? or smartcontrol? classic door (c) or modern door (m) accessories combustion air system back/bottom heat storage stones technical data capacity 2-7 kw nominal heat output 4,5 kw smoke outlet ø 150 mm net efficiency autopilot?/smartcontrol? 81/81% chimney draught, min. (recommended) 12 pa energy efficiency class autopilot?/smartcontrol? a+/a+ weight weight with