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+ Product Details Size - 18"w X 34"h is the size for the duct opening measurement only
+ Product Details Size - 10"w X 32"h is the size for the duct opening measurement only
+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only
Actual Filter Size – 29 3/4"w x 31 3/4" x 1"
+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only
14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Grille w28h28 + Product Details Size -+ Product Details Size 14" x 28" or 28" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 16. 5" X 30. 5". 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