Here's the deal on connecting oxygen concentrators - it doesn't matter what the LPMs are, but you want to try to match the psi output as closely as possible.
The higher psi unit will pressurize the oxygen line to its pressure and the second concentrator has to push to get its oxygen into the line, too. This is why you will see one concentrator pushing say 4.5 LPM and the other pushing 2 or 3, for example. The higher psi unit will always be able to get more of its oxygen into the line than the lower psi unit. This in and of itself does not harm the concentrators. It's a good idea to have check valves in your Y connector if your concentrators are putting out dissimilar psi outputs. If the difference in psi is too great (usually more than 2 psi), the lower psi unit will not be able to push its oxygen into the line at all.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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