16" x 36" or 36" x 16" Cube Core Eggcrate Return Air Grille Powder-Coated + Product Details Size -

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

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+ Product Details Size – 16"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 24 3/4" x 1"

16" x 36" or 36" x 16" Cube Core Eggcrate Return Air Grille Powder-Coated + Product Details Size -+ Product Details Size 16" x 36" or 36" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 37. 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