| 摘要 |
A multiple-casing chimney with at least one smoke-carrying inner tube, one heat insulating layer surrounding the inner tube, and one jacket supporting the latter's outside. To prevent moisture saturation or tarring, the invention provides that flow paths for a venting gas supplied from the outside and discharged to the outside be provided within the base material of at least one casing (2, 4) surrounded by the jacket (6) and/or on at least one boundary between adjacent casings (2, 4, 6) between boundary surfaces formed by their respective base materials and be distributed over the circumference.
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