Ventilation and / or flue gas discharge system, comprising an inter-connected concentric inner tube and outer tube, an outer tube stage and a locking element.

摘要

Ventilation and / or flue gas discharge system comprising a, by at least one locking element couplable inner tube and the outer tube, wherein the or each locking element is attached to one of the inner tube or outer tube, and wherein the other one of the inner tube or outer tube is of at least one with a locking element co-operating coupling element to provide. In the mounted state of the inner tube in the outer tube engages the or each locking element to a coupling element, whereby the inner tube is coupled locked in the longitudinal direction to the outer tube. Furthermore, such an assembly, is provided an outer tube and locking element.