10" x 22" or 22" x 10" Cube Core Eggcrate Return Air Grille Grille + Product Details Size –

+ Product Details Size – 28"w X 14"h is the size for the duct opening measurement only

+ Product Details Size – 20"w X 6"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 19 3/4" x 1"

+ Product Details Size – 16" x 18" or 18" x 16" is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

10" x 22" or 22" x 10" Cube Core Eggcrate Return Air Grille Grille + Product Details Size –+ Product Details Size 10" x 22" or 22" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 23. 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