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→Pressure Swing Absorption
These products look physically identical to the Higher Peak products.
===Colorado Altitude Training===
Colorado [[Altitude Training]] provide a wide variety of systems. The CAT 9 and CAT 12 air units provide air at the equivalent of 9,000 and 12, but do not publish prices000 feet respectively. The CAT systems have a 3 year warranty. * CAT-430 Walk-in Tent System with CAT-12 Air Unit $4,595 + $219 shipping* CAT-315 Walk-in Tent System with CAT-12 Air Unit $4,245 + $189 shipping* CAT 12 with Sleeping Mask Kit $3,620 + $99 shipping* CAT 12 with Exercise Mask Kit $3,495 + $99 shipping
==Semi-Permeable Membrane==
===GO2Altitude===