But we are taking about La Femme parfaite S’appelle Stephanie shirt. The concentrators pull O2 from the air, but as far as I know they only go up to a few ppm at most. Or tanks are the SOURCE of oxygen. A non-rebreather mask may be 15lpm but that is only a delivery method, it still needs a source of O2, A tank of oxygen, which is becoming short in supply, or a wall hook up (run by elves maybe?). Home cpap, if that was what you were referring to, doesn’t deliver concentrated oxygen only pushes air.
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We make oxygen by the tonne, primarily for La Femme parfaite S’appelle Stephanie shirt. I’m assuming that the purity of oxygen for industry is much lower than the purity required for medical grade, or there are other processing steps required for medical oxygen. I don’t know how complex the process is to go from steelmaking-grade to medical-grade, or if it’s just a logistics issue, i.e. the tank at the hospital is sized for x number of patients over y days and the number of patients on oxygen is far, far greater than that, causing the tank to empty out much faster than usual.