PRODUCTS › ARMSTRONG DUNE 2X4 SQUARE EDGE Image 1 of 1 ARMSTRONG DUNE 2X4 SQUARE EDGE ₱555.00 Elevate your space with Armstrong Dune 2'x4' Square Edge ceiling tiles. These fine-textured durable panels offer excellent acoustics (NRC=0.50 CAC=35) mold and sag resistance and are easy to install. Perfect for offices retail hospitality and classrooms. Upgrade your ceilings today! Purchase Added! Elevate your space with Armstrong Dune 2'x4' Square Edge ceiling tiles. These fine-textured durable panels offer excellent acoustics (NRC=0.50 CAC=35) mold and sag resistance and are easy to install. Perfect for offices retail hospitality and classrooms. Upgrade your ceilings today!