![Yellow pressurized canisters labelled BREATHING AIR 4500 PSI are attached to metal surface as bland concrete building with fire escapes looms behind](https://fawny.org/blog/images/TorontoFireAcademy_OH06-yellow-500.jpg)
Yet more in the way of yellow tubes
The foregoing posting appeared on Joe Clark’s personal Weblog on 2006.10.20 16:12. This presentation was designed for printing and omits components that make sense only onscreen. https://blog.fawny.org/2006/10/20/4500psi/