Product details:

Mold mildew and sag-resistance. Tegular edge detail minimizes grid look. Non-directional pattern reduces scrap and installation time. Installs in Armstrong Prelude Fire Guard 1516-in grid system. Covers 48-sq ft per carton 12 pieces per carton. Acoustical NRC0. 55 CAC35. Class A fire rating. Fire-resistant ceiling when used in applicable UL assemblies. Common size 24-in x 24-in x 58-in.