Should the duct pipe for the extractor hood be built into the wall or core drilled?

Hello,

Masonry the pipe for the extractor hood into the wall or later with core drilling? The construction manager is for masonry and the kitchen fitter for core drilling. KB said masonry was done in the past, but now core drilling is done so that backflow flaps can be easily installed, otherwise it won’t be so easy! The second KB is for masonry though.
Does anyone have an idea?

Regards

Planned passages do not need to be drilled, they are left open.

So neither of the two, but a wall opening in the suitable cross-section, left open right when laying the bricks.

Planned passages do not need to be drilled, they are left open.

So neither, but a wall breakthrough in the appropriate cross-section, left open right when building the wall.

Build a breakthrough for a round pipe with square stones?

That is probably at most inefficient. Just build the wall up and make a hole exactly fitting. Then it will be tight.

That is probably maximally inefficient.

Matter of taste – I would say the same about first doing it massively and then perforating it: minus times minus equals nonsense. To me, that would seem like a foolish stunt.

I find drilling better. There you have a defined gap of a few millimeters to insert and seal the pipe. We have [Klinker], and that was also a clean job and took just 10 minutes through the two walls.

I find drilling better. That way you have a defined gap of a few millimeters

As already said: matter of taste. The two concepts are opposite, and from the perspective of each one, the other is cumbersome and logically the second choice. Tossing a coin is a fair chance for one of the other equivalent solutions ;-)