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Poster: Milo Minderbinder
Subject: RE: CAT Altitude Tent & Compressor FOR SALE
Body:
rsbones wrote:

Do any of you know how these things work? At real altitude, less oxygen is available for use because of the pressure differential at that altitude. But these machines don't work by changing the air pressure: they just filter out some of the oxygen in the air. So...they must replace that with something. What is that something? Nitrogen?

The manufacturer's websites I've checked never admit how they do it. Higher Peak even claims "No chemicals or additional gases," but that doesn't make sense to me. If you take a given volume of air and reduce the amount of oxygen in it, to maintain the same volume of air you have to add something. What is it?

They don't add anything you retard. They filter out oxygen and this lowers the % of O2 in the air. Thus, the %'s of all the other gasses present in the air that's been filtered goes up (remember percentage is a relative measure). So in that sense, yes, there are more mols of N2, CO2, AR, etc. in the volume of air that occupies the tent then would be present in an equal volume of air outside the tent. But that doesn't mean that the filter unit "adds chemicals" to the air.
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