30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille w36h36 [Outer Dimensions: 38

[Outer Dimensions: 38

40"w X 16"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size - 32"w X 24"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 28 5/8" height

30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille w36h36 [Outer Dimensions: 38+ Product Details Size 30" x 36" or 36" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32. 5" X 38. 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