This standard regulates the installation and main‐tenance of assemblies and devices used to protect openings in walls, foors, and ceilings against the spread of fre and smoke within, into, or out of buildings.
This standard regulates the installation and main‐tenance of assemblies and devices used to protect openings in walls, foors, and ceilings against the spread of fre and smoke within, into, or out of buildings.
