.... how these things worked? Exhaust gases routed to where to heat fresh air and then ejected where?
Andy here is the diagram of the front ( nose ) section of the Beau. In the one we can notice two pipes that seem to be a part of the heating system. The "A" looks like being a pipe of the hot air system ( feeding by the starboard engine ) in the pilot compartment and farther distributing pipe. Because of the diagram I had posted above I would say that the line was ended in the bottom gun section where the hot air could be evacuated with the shell ejector slots. The pipe marked with "B" seems to be a line spreading the hot air to the front gun compartemnt and could be fed by the port engine. The ejection of the hot air could be done in the same way like for the bottom gun section.
And here how it worked IMHO ....
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