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I thought about using the space between the tubing and the brick chimney for heating air, but here, that's forbiden. I guess that the concern is the possible leak of combustion products, mainly CO, by a joint between 2 tubes or a dammaged crimp. If this occurs, it constantly poisons the heated...

It looks like the catalytic converter is responsible of this hot spot. And I'd say that it's a repeated event. Multiple red hot thawings / coolings forged the plate in that shape, not just once. The deep /multi layers scalling in the center can testify that.

If the shaft rattles in its bushings, the play is too wide now. Each time the shaft made a "tic", it went airbone and lands again on the busching's surface. The thin film of oil takes it, aerosolizes in an tiny oil fog and slowly disapears. Local hight points of friction increases the...

It isn't really the temperature, but the density of air / flue that matters. The colder, the denser. The hotter, the lighter. The hight (vertically) of the chimney gives you the size of the gas's column affected by said density. I you rise the top of the chimney, you enhance the difference of...

A laminated sheet metal perhaps, too industrial, but look at a cast iron plate, much more appealing. It's a bit thick, the edges are slightly rounded, and it takes a dark grey patina. It's a common product here since a long time. In my parent's house, we even made the fire directly on the cast...