20" x 26" or 26" x 20" Cube Core Eggcrate Return Air Grille Aluminum Bar + Product Details Size -

+ Product Details Size - 10"w X 24"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 8

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Actual Filter Size – 31 3/4"w x 35 3/4" x 1"

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

20" x 26" or 26" x 20" Cube Core Eggcrate Return Air Grille Aluminum Bar + Product Details Size -+ Product Details Size 20" x 26 or 26" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 27. 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