Fireplace stove, independent of room air

The KG pipe is not UV-resistant and is not suitable as oven air supply because it is not fireproof. The former will eventually damage the pipe, the latter could (should) bother the district chimney sweep.

Two things that should also concern you.

The problem with the 90° bend is that condensation can form in the trap. Also not optimal.

I would buy an oven with water injection

Comment should be in another thread

The KG pipe is not UV-resistant and is not suitable as oven air supply because it is not fireproof. The former eventually damages the pipe, the latter could (should) bother the district chimney sweep.

... the tip is good! What do you recommend? If you know beforehand, you can have the right pipe/material installed.

There are officially approved metal supply pipes that also have a Dibt approval. This way you are on the absolutely safe side. Stove builders and possibly also plumbing professionals can help with that.

If it is supposed to be something makeshift... HT pipes are at least UV-resistant, but also not fireproof. We solved the last piece through the wall with HT pipes, the rest was solved by the plumbing company with a metal pipe.