16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Fixed Blades + Product Details Size -

+ Product Details Size - 32"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 20" or 20" x 12" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

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16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Fixed Blades + Product Details Size -+ Product Details Size 16" x 26" or 26" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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