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This question already has an answer here:

What is the maximum temperature a human can withstand for short periods of time in an environment with dry air (e.g. oven @+300F, other confined spaces) and what would be the immediate risk of being in such environment be (lung damage, core temperature, etc.).

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marked as duplicate by Bryan Krause, theforestecologist, another 'Homo sapien', kmm, David Jun 27 '17 at 12:22

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