Fire efficiency isn't simply the core; brace alloys, screw qualities, and surface systems all impact ratings

https://www.scribd.com/document/1058179918/Copper-Does-Not-Lie-Why-Architects-Select-Salvo-Metal-Works-for-Customized-Smokeshaft-Shrouds-that-Last-a-Century-206280

Fire performance isn't simply the core; brace alloys, bolt grades, and finish systems all affect rankings, so settings up are examined with each other for real-world conformity.