If there is a REAL chance that a flame will smoke up your house, then you are talking about sakanas nefashos, because smoke can asphyxiate people. In THAT case, and I was taught even in a SAFEIK sakanas nefashos, you can shut it even on Shabbos, much less Yom Tov. I have an oven that can be turned on and off on Yom tov, because the pilot runs continuously and never goes out, never is ignited electrically, or the like. It is a very old stove. I won’t get rid of it specifically because of that continuously-on pilot. I am actually the envy of many of my friends who own newer stoves.
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