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You don't climb in and out of an iron lung. If you're using one you're in it 24x7.

Iron lung use was not 24x7 for all patients. Saying so might be considered by some to be extremely disingenuous or even ridiculous.

Iirc iron lungs are better than CPAP, as the positive pressure caused by CPAP, if too big can stress the lungs.

Iron lungs use negative pressure so they don't suffer from this