High fire resistance chimney for internal installation, has venting channel between inner and intermediate tubes and insulation chamber between intermediate and jacket tubes

摘要

The chimney has an inner tube of material resistant to exhaust gas, an intermediate tube and an external jacket tube. There is a venting channel between the inner and intermediate tubes and an insulation chamber between the intermediate and jacket tubes. The width (2) of the annular cross section of the venting channel (3) is at least 50 mm.