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As for statistic in whole of Finland there was 10 carbon monoxide poisoning deaths (probably most from closing damper plates too early this number includes all cases not just sauna related). Other deaths in sauna was 45 so slippery floor or too much to drink in sauna (if you fall asleep in there it is dangerous) is much more deadly. https://www.stat.fi/til/ksyyt/2010/ksyyt_2010_2011-12-16_tau_004_fi.html
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