| 摘要 |
Exhaust-gas routing for the exhaust gases of a gas burner of a water heater, consisting of an inner tube string 2 which is arranged within an outer tube string 4, through which fresh air flows in countercurrent to the burner, at a distance from the wall of the said outer tube string, the wall of the inner tube string 2 which surrounds the exhaust-gas routing 1 being designed to be gas-tight with respect to the fresh-air routing 3 surrounded by the outer tube string 4, in that, in an outer tube string composed of tube sections, the said inner tube string has a wall continuous over its entire length and consists of plastic or is coated with a plastic layer. <IMAGE> |
