T-Bar Drop Ceiling Grille - Flat Plate Plaque Difsuer - 24" x 24" - 12" Collar 6" Round Duct Pipe + Product Details Size -

+ Product Details Size - 30"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 8"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 34 5/8" width X 20 5/8" height

+ Product Details Heavy-Duty Steel Construction - Made from 20-gauge steel for superior durability and reliable performance

actual front end outer dimensions are approximately 22 5/8" width X 38 5/8" height -

T-Bar Drop Ceiling Grille - Flat Plate Plaque Difsuer - 24" x 24" - 12" Collar 6" Round Duct Pipe + Product Details Size -Heavy gauge all steel construction. Powder paint coating White One model suits both T Bar and Drywall installations Ideal for VAV systems. Matching OBD dampers, baffles and plaster frames available. These Supply Diffusers with integral round necks are recommended for heating, ventilating and cooling. Round neck to square face construction results in 360 degree air diffusion pattern similar to a full round diffuser. High diffusion induction rates