The dimensioning of flue gas systems and chimneys depends on the connected fireplaces.
However, the resulting efficiency of the flue gas system is subject to natural fluctuations due to temperature changes between seasons and the weather. In order to ensure a safe operation, flue gas systems are designed for an assumed outside temperature of 15 °C (according to EN 13384). During the heating period when the system is used the most, an unfavourable temperature drop may cause an excessive negative pressure in the system.
As a result, the combustion becomes noneconomical. The efficiency decreases, the energy consumption increases. The draught regulator limits the negative pressure to a value that is optimal for the fireplace.
Draught regulators, also called secondary-air appliances in the DIN 4795, are mechanical or motor-driven components that create steady negative-pressure conditions in flue gas systems.
As soon as the draught regulator opens and limits the negative pressure by supplying additional air. This process is as simple as it is effective and ensures a steady combustion and measurable energy conservation. Investments in draught regulators amortize within a short time and offer simple possibilities to save on heating costs in both private and industrial use. Another argument for draught regulators is, that a steady combustion lowers the emission of contaminants.