18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 + Product Details Size –

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

+ Product Details Size – 32"w X 20"h is the size for the duct opening measurement only

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

featuring a 6" round duct opening

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18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w22h22 + Product Details Size –+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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