It is not always beneficial to reduce the air, e.g. in the feeder, but also e.g. in the dolniak, because then the so-called chimney loss grows quite seriously, two eco-pea coal fossils burns the same one 12 kg a day and the other 20 kg because the latter has an acetylene burner and it collapses like in a metallurgical furnace but this it will blow the chimney without keeping up to heat up, give it to the heat exchanger, everything must be moderated.
