Fire efficiency isn't just the core; bracket alloys, bolt qualities, and coating systems all impact ratings

https://echo-wiki.win/index.php/Salvo_Metal_Works:_The_Architect%27s_Partner_for_100-Year_Copper_Smokeshaft_Shrouds

Fire efficiency isn't simply the core; brace alloys, bolt grades, and surface systems all influence ratings, so assemblies are tested together for real-world compliance.