A. Not worried about CO2... CO is what is worrysome.
B. The appliances you talk about use burners that are designed for higher efficiency as well as indoor use, a standard "Turkey Fryer" burner is built for pumping raw gas into a flame, this can lead to incomplete combustion and CO (carbon MONOxide). This is what gets most people in trouble, Hey my stove is propane so this is fine.... well it ain't.
BUB
No harshness intended just I know a dude that killed himself that way and well it's a shitty deal.



