Well there is no risk of the wood combusting from the temperature inside, in the short term.
What happens over the long term is that the constant heat dessicates the wood until all that is left is a lightweight shell.
This can happen too to the 2x4 or 2x6 wood joists in a wall, even behind sheetrock, which is why woodstoves need a specific gap between them and the wall, even when the wall feels cool to the touch.
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