The 15/16'' FireSecure Stab System and Protectone® ceiling assembly offers fire-rated solutions for 2' x 2' and 2' x 4' modules. The 15/16'' FireSecure Stab System is suitable for use in the following UL/ULC Fire Resistive Assemblies: D203, D205, G208,G218, G248, G255, I210, I211, L201, P204, P259, P260, P261, P264, P266, R224 as well as seismic categories A-C Tested in accordance with ASTM E119 for certain time-rated fire-resistive assemblies that are listed at UL.com and certainteed.com/architectural