Quote from @John Carbone: Quote from @John Underwood: This is why I only have nice charcoal grills. 

The decreased size can cause carbon dioxide to fill up in the basement, this could cause injury and death to your entire family"While both are technically correct, One gives you an idea to repair, the other has now told you if you buy this house your family will die.Good Luck!

Ohh and gor all the youngins out there BCC stands for "blind carbon copy" back when you used carbon papers to create multiples 

The next day at around 5pm they took a shower and an old carbon monoxide detector alarm went off. 

Quote from @John Carbone: came across this article tonight.

@Mark Franks teflon or carbon goes a long way on keeping your locks operating properly

@John Carbone glad to know we're not doing anything wrong!

Also, if it happens to be poly-carbonate, which is "unbreakable", like Lexan for example, it would also prevent someone from being able to break out the window for emergency egress.

Maybe I've been fortunate to see this playing out in real time and have a glimpse of the future, but I can say that biggest investors care and are looking for a strategy that considers the Environmental piece, and not that's not just about carbon footprints, but risk mitigation as well.   

Inspectors should have carbon monoxide meters to read any back flow of a chimney, lined or not, if it isn't flowing properly, feeding back gases, get it fixed.Yes, a liner will solve many issues, they lock in place and are fairly air tight to achieve better air flow than an old brick or stone chimney, capped properly at an elevation above the roof line they will solve emissions better than a masonry chimney.