Make sure you look closely at the flue in the attic.
Isn’t this why we install attic ventilation, to get rid of any unwanted extra gassses. Sarcasm intended for those who don’t see it.
AND the old timey CO alarm wired to it for early warning!!!
One needs to keep the spiders warm and cozy!!
you might be right. That is funny.
LOL That will fix it!:lol:
Natural draft, extra dilution air, free attic ventilation, genius!