6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size –

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 25"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 11 3/4" x 1"

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6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Grille Material_Steel + Product Details Size –+ Product Details Size 6" x 8" or 8" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" width X 9. 75" height. 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%,