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I read about this and @Velocio mentioned it in his post. I guess to mitigate that, something like a chimneysheep could be periodically removed to allow the chimney to breathe.
By having the chimney un-capped but not running the fires, are we at risk of this anyway?
Other than an obvious point at which heat escapes from the place, what the future issues I need to avoid? The fireplaces are still present and we will keep them (or at some point in the future remove the breast completely). But I wouldn't be surprised if there's some kind impending disaster if fireplaces remain unused for long periods of time that I'm unaware of.