Pressure
What ATA means and why 1.3, 1.4 and 1.5 differ
ATA is atmospheres absolute. Sea level is 1.0 ATA; a chamber at 1.5 ATA holds the user at one and a half times atmospheric pressure, which raises the amount of oxygen dissolved in the blood when breathing concentrated oxygen through a mask or cannula. Mild hyperbaric chambers sold for home use typically run 1.3 to 1.5 ATA; hospital chambers run 2.0 to 3.0 ATA for approved indications.
Every chamber here runs 1.4 or 1.5 ATA. Higher pressure means a sturdier shell, a stronger compressor and more weight, which is the main reason hard-shell chambers cost more. Oxygen concentrators are sold separately or as part of a package; ask our team for the configuration on each model.