Furnace

A furnace for thermal treatment of material, wherein a pyrolysis gas is released from the material during the thermal treatment, comprising:

• a) a housing;
• b) a process space, which is located in an inner space of the housing and which is bounded by a process space housing and through which material can be guided, the process space being located next to or near an inlet opening of the process space housing, the material to be treated passing through and being fed into the process space through the inlet opening;
• c) a process space atmosphere which is heated and prevails in the process space;
• d) an extraction system, by means of which process space atmosphere loaded with pyrolysis gas can be exhausted from the process space,
• wherein
• e) the extraction system comprises at least one exhaust device with an exhaust duct which is bounded by a duct wall and which is connected to the process space via an exhaust opening, the exhaust duct extending through the inlet opening and entering the process space adjacent the material to be treated, wherein the material enters adjacent and external to the exhaust duct;
• f) the exhaust opening is arranged in a region of the process space in which, during operation of the furnace, a temperature prevails at which no or only moderate chemical reactions occur between the pyrolysis gas and the process space housing and/or the duct wall.