Funny, there was a bloke once, and I've read some of his stuff.
Franklin (???)...had a high level of importance at some stage as a scientist and founder.
Had a lot to say about fireplaces, heat, heating, draft.
Loads of ways to get convective heat (even natural circulation, no blower) out of them. Air must be introduced from elsewhere, not drafts, as they suck cold air into a heated room.