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

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

+ Product Details Size - 4"w X 22"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

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