Why the correct flue is necessary for heating firewood?
Because when burning firewood big heat is allocated and, as a result, the flue is heated. If to put a flue made of inappropriate stainless steel, the flue will burn through. The pipe with the high content of carbon will be made red-hot. Of course it is possible to argue differently: you go to a market and buy a thinner and cheaper flue, with a discount card.
But in all that concerns fire, it is reasonable to observe all precautionary measures as much as possible! It is better excessive care, than excessive risk. This is misfortune when baths burn; it is the tragedy if people perish. But what does it mean? Not to build a bath? Of course, to build! The correct flue is necessary not as a safety cushion, but as serviceable brakes in the car.
If to put the correct flue, the problem of removal of a smoke will leave forever. For the correct flue its thickness has to be at least 1 mm. AISI 321 stainless steel with the titan. Not to put at all a flue which is attracted by a magnet (ferritic stainless steel) it is impossible to use such thin internal pipe which can be crumpled by a hand. You don't build a house of a cardboard.
Therefore don't put in it a flue of a foil! Thickness of the used basalt heater is 35 mm. In the table the internal diameter of a pipe and the price in hryvnias is specified. For example, for a pipe with a diameter of sleeve of 100 mm an external diameter of cover is 170 mm.You can look at appearance of an element, having clicked on the corresponding position in a price list.
Proper chimneys do not burn out.
Therefore, we use only solid AISI 321 (08X18H10T) stainless steel with a thickness of 1 mm and above for chimneys using solid fuel. This stainless steel is acid and heat-resistant, therefore it can withstand high temperature and condensate.
In addition, the thickness of the basalt insulation used is 35 mm, and it can withstand temperatures of 650 degrees. When choosing stainless steel for the chimney, it is necessary to take into account the temperature of the outgoing gases indicated in the passport data of the heat generating device, as well as the burning temperature of the wood that you will use.
In addition, it should be borne in mind that when soot is ignited (and this is a product of incomplete combustion of the fuel), a temperature of 1200 degrees can be reached, which, for example, exceeds three times the maximum temperature for AISI 409.
Do not forget about acid condensate, which primarily affects the weld of the pipe. Since nickel is absent in AISI 409 stainless steel, which is responsible for the corrosion resistance of the metal, such a chimney made of "stainless" steel will become unusable quite quickly.
In times of crisis, of course, there is a desire to save money, but it must be borne in mind that a stainless steel chimney is not a cheap purchase in any case, which either solves the issue of smoke removal or leaves the question open. Due to the presence of nickel, chromium and titanium in AISI 321 stainless steel chimneys, the crystal lattice remains strong, resistant to high temperatures.