Black T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 24" x 24" - 10" Collar Compatible with Duct 10" + Product Details Size -

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

+ Product Details Size – Stick-on collar is 18" and it is compatible with duct 18"

+ Product Details Size - 18"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Size – 18"w X 12"h is the size for the duct opening measurement only

Black T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 24" x 24" - 10" Collar Compatible with Duct 10" + Product Details Size -+ Product Details Size 24"w X 24"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 10" 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