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Good Evening Everyone. This is my first post here. Thanks largely to the information here I finally have oxygen therapy. It was a long road getting here and it truly amazes me how effective it is. I am now looking at upgrading to a demand valve like the Allied Healthcare Products L063. My question is should I get the 0-40lpm or 0-160lpm model? Does the 40lpm model have high enough of a flow rate to keep up with the breathing technique? Thank you in advance!