24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size –

+ Product Details Size – 18"w X 8"h is the size for the duct opening measurement only

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75" width X 29

+ Product Details Size - 14"w X 22"h is the size for the duct opening measurement only

24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size –+ Product Details Size 24" x 26" or 26" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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