6" x 10" or 10" x 6" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size -

+ Product Details Size - 18"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size – 22"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 6" x 20" or 20" x 6" is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

6" x 10" or 10" x 6" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size -+ Product Details Size 6" x 10" or 10" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 11. 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