Key takeaways
- ml/min = volume of H₂ delivered per minute at the outlet.
- Real-world delivery depends on purity, cannula and breathing pattern.
- Two machines at the same ml/min can deliver very different sustained output.
What the number means
ml/min is millilitres of gas leaving the outlet per minute. At ≥99.99% purity, essentially all of that is H₂. At lower purity, a chunk is water vapour or oxygen.
Sustained vs peak
A machine may hit its headline ml/min for 5 minutes from cold start and then drop as the stack warms. Check the continuous run-time figure: that's what you'll actually breathe over a 60-minute session.
Frequently asked questions
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Hydrogen concentration explained
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Source content adapted from hydrogen-inhaler-how-long.