12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size –

+ Product Details Size – 6" x 22" or 22" x 6" is the size for the duct opening measurement only

these louvers provide exceptional protection against rain and water

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

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+ Product Details Size – 26"w X 26"h is the size for the duct opening measurement only

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille ceiling + Product Details Size –+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 19. 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