Spec Watch
Short factual notices, newest first. Each one records what a manufacturer or regulator publishes, the date the source was read, and what it changes for a buyer. Nothing here is a change we did not observe.
Specifications move. A manufacturer repopulates a table, publishes a new catalog with different numbers than the old one, or a regulator puts a date on an edition of a standard. Spec Watch records those events with the date the source was read, so a corrected cell in the comparison table has a paper trail instead of appearing silently.
There is no schedule. A bulletin is written when something verifiable happens, which may mean nothing for months. If a change cannot be shown against a dated primary source, it does not get written up.
Commercial interest: We sell and install hyperbaric equipment from several manufacturers, including some named below. Bulletins record what the source publishes, including when that is unflattering to equipment we sell.
31 August 2026Manufacturer 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.
31 August 2026Manufacturer page
Three Sigma 40 cells that read “Not published” in our table are published on Perry's own product page, and are now transcribed.
31 August 2026Regulatory
Recognition 1-154 for PVHO-1-2019 is superseded by 1-181 for PVHO-1-2023, with a declaration-of-conformity cutoff of 26 December 2026.