20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille return filter } ul { margin-bottom: 15px

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Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

positioning supply and return grills accordingly

actual front end outer dimensions are approximately 12 5/8" width X 8 5/8" height -

20" x 22" or 22" x 20" Cube Core Eggcrate Return Air Grille return filter } ul { margin-bottom: 15px+ Product Details Size 20" x 22" or 22" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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