20" x 20" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper + Product Details Size –

+ Product Details Size – 12"w X 6"h is the size for the duct opening measurement only

the second number represents the height

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

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

20" x 20" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper + Product Details Size –+ Product Details Size 20" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 21. 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 electric