I did a little reading on this subject because I wanted to verify that it's okay to burn propane indoors. my mother lives in a condo and has a indoor fireplace that is not vented Burns Natural Gas. We have installed a carbon monoxide detector and it has never gone off in 7 years. So what I learn from reading is that propane Burns cleaner than Natural Gas and does not emit carbon monoxide unless the flame is not tuned properly. If it is not tuned properly and burning cleanly it will then produce carbon monoxide. If there is a lack of oxygen in the air it tends to produce carbon monoxide but the general by product is carbon dioxide which is okay
