Emission measurement data of a wood log stove in natural draft operation compared to constant draft

In the public debate about air pollutants, log fired appliances and especially wood-burning stoves are increasingly being criticized. The assertion that the furnaces only comply with the required emission limit values as part of the approval test is being asserted more and more. Furthermore, the emissions would only be achieved by creating "optimal conditions". This generally describes the test according to the standard with a constant draft in the measuring section. The assertion is usually supported by measurements based on the approval test procedure with different parameters. The manufacturer's specification "minimum flue draft" refers to the pressure that the flue gas system should at least reach during operation at nominal heat output in the worst case; with deviating outputs, depending on the insulation standard and the mass of the chimney in real operation, there will be a correspondingly deviating pressure. Basically, the question should be investigated whether and under which boundary conditions a performance-independent constant draft can actually be regarded as the optimal test condition. In addition, the emissions, which are determined with natural draft, are to be set in relation to the emission factors with which modern log wood furnaces also burden the emission inventory.