David Bolton Steel Door Window Lite Kits on Hollow Metal Doors: Why the Glass Spec Gets Locked In Before the Fire Rating Is Confirmed The Problem That Happens Before the Kit Ships This article is for contractors, facility managers, and architects who are sourcing window lite kits for hollow metal doors. Specifically, it covers one o... NFPA 80 compliance fire-rated doors hollow metal doors steel door hardware window lite kits Jun 7, 2026
David Bolton Retrofit Window Lites on Steel Doors: Why the Glass Spec Gets Finalized After the Door Is Already in Service Why This Decision Keeps Getting Made in the Wrong Order This article is for facility managers, commercial contractors, and maintenance teams who need to add a vision panel to a steel door that is alre... fire-rated doors hollow metal doors retrofit door hardware steel door hardware window lite kits Jun 3, 2026
