Armstrong Ceilings 24 in x 24 in Kitchen Zone 16 Pack White Smooth 15 16 in Drop Acoustic Panel Ceiling Tiles value:Case concrete or asphalt Feature 4 concrete or asphalt Feature 4 Text For use on patios Finished opening width is suggested to be 4 in smaller than the door width Soil resistant Smooth surface meets USDA FSIS guidelines for use in food processing areas Square edge detail allows for quick and easy cutting of panels Installs in Armstrong® Prelude 15 16 in grid system Covers 64 sq ft per carton (16 pieces per carton) Acoustical (CAC=33) Class A fire rating Common size: 24 in x 24 in x 5 8 in Collection Name Kitchen Zone Actual Length (Inches) 23