[throw0101c]

> A sealed house with a fire burning in it is a suicide machine.

Modern designs use direct vent systems, where instead of using inside air for combustion, they bring in outside air (and then exhaust externally as usual):

* https://www.efireplacestore.com/five-things-about-direct-ven...

The warming of the house occurs via radiant heat and through any conduction of heat via the actual material of fireplace or stove.

[jefftk]

That's not an open fireplace, though?

(And so while the house is sealed, the fire is not burning with the sealed boundary of the house.)