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So, when you said safety, you meant what exactly...
Honestly, I do not speak from authority. Maybe the reason we don't get sleepy in Merc w/recirc is because it does let in a 'legislated' amount of 'periodic' oxygen.
As an ex-airforce pilot, I'm well aware of oxygen deprivation. Driving w/recirc has absolutley no resemblance.
So, if you run a car in the car in a garage, windows closed and recirc On, you're saying you will still eventually die of carbon monixide? Since the car is 'legislated' to bring in outside air? I heard a standup comic do a blonde joke on this once...
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