1200 Seismic ceiling suspension in Intermediate and Heavy-Duty options are the industry standard for suspended ceilings. All ceiling grid is compatible with acoustical panels, lighting and air diffusers. Ceiling suspension is flame spread Class A and suitable for general areas. 1200 Seismic is ICC-ES listed for seismic ceiling suspension applications and all CMC stab cross tees include Quick-Click™ integral clips for fast and sturdy installation. Select ceiling grid components are available in HRCmax™ (High Recycled Content) to maximize results on sustainable construction projects