Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
Thanked 387 Times in 367 Posts
Rep Power: 10
CO is the byproduct of combustion, with incomplete or inefficient combustion producing higher levels of CO, especially if there is a lack of oxygen.
Any open flame in a confined space is a potential CO source. Ventilation and efficient combustion is key.
btw, CO's density is close to that of air and so cannot be counted on to vent up and out, but neither is it sure to sink like propane.