People complain that it’s dead hot inside a face mask, but when you think about it, the time to worry is when it’s not hot. You’re exhaling air at 37 deg.C into what is supposed to be a barrier against nasties in the air outside.
So if the mask is doing its job, it’s bound to heat up. And the only time it won’t heat up will be if you’re not breathing out hot air; in other words, dead!
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