Compare Hyperbaric — Spec Watch https://comparehyperbaric.com/spec-watch/ Dated bulletins recording changes to published hyperbaric chamber specifications and to the standards those chambers are declared against. en-us Hyperbaric Service Pros (Mr. Fix All Handyman LLC) hello@comparehyperbaric.com (Hyperbaric Service Pros) hello@comparehyperbaric.com (Hyperbaric Service Pros) Mon, 31 Aug 2026 12:00:00 GMT https://www.rssboard.org/rss-specification build.py Sechrist publishes two different interior diameters for the same three chambers, and no operating pressure in either current document https://comparehyperbaric.com/spec-watch/sechrist-two-interior-diameters https://comparehyperbaric.com/spec-watch/sechrist-two-interior-diameters Mon, 31 Aug 2026 12:00:00 GMT Manufacturer document Sechrist's current site and its March 2026 catalog say 33, 36 and 41 inches; the older catalog our table was built from says 32.50 and 35.50 inches. Perry Sigma 40: operating pressure, weight and external dimensions are published after all — three of our cells corrected https://comparehyperbaric.com/spec-watch/perry-sigma-40-specification-table https://comparehyperbaric.com/spec-watch/perry-sigma-40-specification-table Mon, 31 Aug 2026 12:00:00 GMT Manufacturer page Three Sigma 40 cells that read “Not published” in our table are published on Perry's own product page, and are now transcribed. FDA stops accepting PVHO-1-2019 declarations of conformity on 26 December 2026 https://comparehyperbaric.com/spec-watch/fda-pvho-1-2019-recognition-sunset https://comparehyperbaric.com/spec-watch/fda-pvho-1-2019-recognition-sunset Mon, 31 Aug 2026 12:00:00 GMT Regulatory Recognition 1-154 for PVHO-1-2019 is superseded by 1-181 for PVHO-1-2023, with a declaration-of-conformity cutoff of 26 December 2026.