Very likely; when I use my propane forge I try to keep a 10'x10' door open at either end of the shop, (except for when the wind is blowing anvils over, then I only open them 1/2 way...).
Of course I do a lot of knife work and so often have my propane forge tuned towards reducing and so CO producing.
Also if you re-run any of your exhaust back into the forge the chance of CO production goes way up.
A CO detector would be a good idea...
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Thomas
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