I have been useing propane forges in buildings for about 15 years. The comercial ones that I use all are pretty lean and have never shown CO on my detecters. I have two from Rex Price and if not tuned lean they will start putting out CO pretty quick, so pretty much what Thomas Powers said. My climate is different than his and I close my doors this time of year. I do keep a window part way open to replace O2. Also I have a hood over my main forge to vent the water.
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