8" x 8" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 11" x 11"] Width_8in grid-template-columns: repeat(3 AD-S-230-10x10 Actual Filter Size 25 Width_8in

grid-template-columns: repeat(3

+ Product Details Size – 26"w X 6"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 28" or 28" x 8" duct opening (measured at the opening)

Suitable for High Wall Split Systems

+ Product Details Size – 36"w X 8"h is the size for the duct opening measurement only

8" x 8" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever Operated Damper for Air Flow Control [Outer Dimensions: 11" x 11"] Width_8in grid template columns: repeat(3 AD S 230 10x10 Actual Filter Size 25 Width_8in grid template columns: repeat(3 + Product Details Size – 26"w X 6"h is the size for the duct opening measurement only