Black T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 24" x 24" - 6" Collar w20h20 + Product Details Size –

+ Product Details Size – The size 30-gauge stick-on collar is 14" and it is compatible with duct 14"

+ Product Details Size – 36" x 36" is the size for the duct opening measurement only

+ Product Details Size - 24"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 28 5/8" height

actual front end outer dimensions are approximately 38 5/8" width X 8 5/8" height

Black T-Bar Drop Ceiling Grille - Flat Plate Plaque Diffuser - 24" x 24" - 6" Collar w20h20 + 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 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