Buddy of mine has an outdoor fireplace He's gbuilt a woodshed and split/stacked about 6 cords at his place this year. HE was outside this week burning his waste wood (bark, shorts, crazy pieces, rotten pieces, etc. ) that had been produced from all the splitting. One of the neighbors came over to ask if he didn't think that was producing carbon monoxide. When he told me that I just about fell down. I'm sure he smiled and smoothed it over. Glad my neighbors are bit farther away from me.