Bullerjan and many other stove producers recommend the use of a draught regulator / secondary air device.
The draught regulator ensures a permanently constant draught in the chimney. This ensures a significantly lower consumption of wood, protects the environment and – last but not least – the stove.
Regardless of the results that a chimney calculation program outputs after entering the present values, it has to be taken into consideration that in the cold state the chimney exhibits a basic draught/ under pressure in the amount of at least 5 Pascal (Pa).
In the event that the basic draught is too low, flue gas can ingress in the installation room, in the course of the initial combustion.
The maximum draught that the chimney exhibits during the heating operation must not exceed 16 Pascal (Pa). Insofar as the draught is too high, the wood burns too quickly and the oven cannot unfold its full heating and environmental qualities.
In the extreme case an excessively high draught in the chimney results in damage of the oven and in particular of the catalytic converter – if inserted.
Furthermore, ash from the combustion chamber can under these circumstances ascend into the catalytic converter – if inserted, which in turn can cause malfunction of the stove and can as a consequence lead to flue gas leakage into the installation room.
A remedy in this case is an automatic draught regulation of the chimney. Please contact your authorised Bullerjan® – trade partner or chimney sweeper.