18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Details Size –

+ Product Details Size – 26" x 32" or 32" x 26" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 34 5/8" height

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+ Product Details Size - 24"w X 20"h is the size for the duct opening measurement only

75"H – fits a 12" X 6" duct opening

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille 1-Way + Product Details Size –+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 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