Naber duct box for 540mm wall

Hello everyone,

I recently ordered the Naber E-Jal Col Thermobox 150mm wall box for our kitchen extractor hood.
The package arrived yesterday, and only then did I realize that it is only suitable for a total width of up to max. 500mm.

I have already seen that there are telescopic pipes with a diameter of 150mm. Does anyone know if you can use just any random one?
I would like to hear about your experiences on this topic.

Thank you very much and best regards
Julian

and unfortunately I only noticed then that this is only suitable for a total width of max. 500mm.

Oh God. Where do you live that 500 mm is not enough or what is the question?

Oh god. Where do you live that 500 mm is not enough or what is the question?

The question aims at whether I can use any telescope tube with a diameter of 150mm. Or does it have to be one from Naber?

That does not matter for sure, but if you stay within the system, it is always better. The systems are coordinated with each other there. Otherwise, everyone rejects the responsibility.