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Good questions, first, it does not produce measurable amounts of CO IF you observe simple operating precautions and practices, crack a window position a little, vent the trailer air a bit, it is complete in it's combustion, almost 100% efficient. All ventless heaters have a ODS; Oxygen depletion sensor, which is simply a very small pilot orifice if there is a depletion in the oxygen, the pilot light goes out and the unit won't function. I ran the heater on high for 4 hours, on and off. It really heats the trailer well. I will continue to use it this winter as I work on the interior, and monitor the air quality.
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