18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe + Product Details Size –

+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

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

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe + Product Details Size –+ Product Details Size 18" x 26" or 26" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 27. 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