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Face masks rarely deliver 100% oxygenI would like to make some observations following the article on conventional non-rebreather masks (NT Clinical, 7 August 2007, p26).While a tight-fitting mask with no side ports should be able to deliver 100% oxygen, commonly quoted values acknowledge that some dilution does occur, although this is rarely quantified and is assumed to be minimal.However, in the US it is not uncommon to see an anti-suffocation port with a valve removed ...

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