8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow + Product Details Size –

+ Product Details Size – 32"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 24"h

Actual Filter Size – 13 3/4"w x 11 3/4" x 1"

+ Product Details Size – 10" x 18" or 18" x 10" is the size for the duct opening measurement only

+ Product Details Size - 24"w X 16"h is the size for the duct opening measurement only

8" x 36" or 36" x 8" Cube Core Eggcrate Return Air Grille Color_R-4.2 Yellow + Product Details Size –+ Product Details Size 8" x 36" or 36" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 37. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing