Fire Blockers is a Dallas–Fort Worth specialty firestopping contractor with a dedicated FM 4991 information hub on its own site stating that it is an FM 4991 approved contractor and Hilti accredited. Scope covers through-penetrations, head-of-wall, edge-of-slab, perimeter fire containment, acoustical caulking, and firestop inspection and repair. It works heavily in healthcare construction, and notes that building code requirements increasingly mandate FM 4991 certified contractors and third-party inspection. It has traded since 1996.