8" x 22" or 22" x 8" Cube Core Eggcrate Return Air Grille Ceiling /* Adding space between bullet

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75"H – fits a 18" X 18" duct opening

Actual Filter Size – 33 3/4"w x 35 3/4" x 1"

Actual Filter Size – 19 3/4"w x 15 3/4" x 1"

8" x 22" or 22" x 8" Cube Core Eggcrate Return Air Grille Ceiling /* Adding space between bullet+ Product Details Size 8" x 22" or 22" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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