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There are various hypoxia (altitude) systems on the market that vary widely in price. Here are some notes I've made while looking at the market place. I believe that Higher Peak offers the best value in mechanical systems, but I purchased an [[AltoLab]].
==Mechanical Hypoxic Generators==
Mechanical generators<ref name="hypo"/> either use Pressure Swing Absorption<ref name="psa"/> or a semi-permeable membrane<ref name="semi"/>. These generators tend to be expensive to purchase, but require no ongoing maintenance.
