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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. Apparently CAT, Hypoxico, and Higher Peak use generators from the same supplier.
===Hypoxico===
Hypoxico systems is an established manufacturer. The prices shown below were what I was quoted in 2009. There are no published prices on http://www.hypoxico.com/ but some prices are shown at http://www.bikemania.biz/Altitude_Trainers_s/185.htm* Everest Summit, $45,900550. Provides 12,500 ft, or 21,000 ft with a $200 adapter. (Looks physically identical to Higher Peak MAG-10)
* HYP123, $5,500. Provides 12,500 ft, or 21,000 ft with a $200 adapter. Upgrade to HYP100.
* HYP100, $4,900700. Provides 9,000 ft, or 2114,000 500 ft with a $200 adapter. Upgrade to HYP100(21,000 ft for IHT with add on.)
* Conversion for use in exercise - $700
* Tents - $350+