T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 12" x 12" - 6" Collar Color_Red Oak Wood Actual Filter Size – 7

Actual Filter Size – 7 3/4"w x 11 3/4" x 1"

The premium durable material guarantees that they will never rust or wear through

Actual Filter Size – 17 3/4"w x 17 3/4" x 1"

Heavy Gauge Steel

T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 12" x 12" - 6" Collar Color_Red Oak Wood Actual Filter Size – 7+ Product Details Size 12"w X 12"h. These are specially sized to fit into all drop ceilings, also called T Bar systems. Can be hooked up with our "Butterfly Dampers" for precise airflow control. For 6" duct opening High Quality Heavy gauge all steel construction. Installation Location Ceiling. Design These Supply Diffusers with integral round necks are recommended for heating, ventilating and cooling. Round neck to square face construction results in