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Thanks for your help, Hearthman. You and this thread have been incredibly helpful. I've been doing a ton of research and I think I get the whole stack effect, pressure differential, etc. that is...

Hearthman, thanks for the response but I'm not sure I follow you. Don't I WANT an airtight house in the living areas?? So the past of least resistance for cold air is through my FP - wouldn't a...

I recently bought a new house with the Lennox MPD-4035 model LP gas direct vent fireplace in the family room. The fireplace is located in a bumpout (i.e. a small framed extension that protrudes from...