2424By setting the interval between position 1 and 2 (see next section) ensures optimumutilisation of the energy content of the wood, as there is oxygen for combustion andfor the burning of the pyrolysis gases. When the flames are a clear yellow the damperhas been set correctly. Finding the correct position comes with time after regular use ofthe stove.We do not recommend to turn it down completely, because it feels too hot. Too littleair supply gives poor combustion, which can cause high and dangerous flue gases,emissions and poor efficiency. This results in dark smoke emanating from the chimney,and the calorific value of the wood not used to its fullest.VentilationThere must not be an extraction/range hood (kitchen) in the same room as the stove asthis may cause the oven to emit fumes into the room.The stove requires a permanent and adequate air supply to operate safely and efficient-ly. There can be fitted a permanent air supply vent to the room to the stove's combus-tion air (see section on Air System).This air vent should not be shut off or sealed under any circumstances.Use of the stoveAdjustment of the air dampers - the damper has 3 settingsSee diagrams at the front of the manual.Position 1Push the lever fully to the left.The damper is closed; there is a minimal air intake.This option should be avoided during normal operation.See warning note after next section.Position 2Pull the lever to the right up to the first notch (center position).This position gives only secondary air.During ordinary stoking the lever is set between position 1 and 2.When the flames are clear and yellow, the damper is set correctly - resulting in a slow /optimal burning.Position 3Pull the lever to the right.The damper is fully open and provides full ignition air (primary) and full secondary air.This position is for the lighting stage and refuelling and is not used during normaloperation.English RAIS/attika - User manual for VISIO 3-1