T-Bar Drop Ceiling Grille - Flat Plate Plaque Difsuer - 24" x 24" - 12" Collar w14h14 + Product Details Size -

+ Product Details Size - 26"w X 4"h is the size for the duct opening measurement only

Outer Dimensions Are 17

And The Cooler Air From Outside WIll Flow In From The Bottom

Actual Filter Size – 31 3/4"w x 19 3/4" x 1"

T-Bar Drop Ceiling Grille - Flat Plate Plaque Difsuer - 24" x 24" - 12" Collar w14h14 + 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