20" x 20" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper See chart below:

See chart below:

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

+ Product Details Size – 4"w X 10"h is the size for the duct opening measurement only

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

20" x 20" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper See chart below:+ 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