The DeVilbiss 525KS 5L O2 concentrator delivers a reliable supply of therapeutic oxygen for patient use . This system is notably intended for people requiring a gentle flow of up to 5 L per min . https://devilbiss525ks5loxygenco050367.ttblogs.com/21757420/devilbiss-525ks-5l-oxygen-concentrator-a-comprehensive-review