30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille w36h36 14" Diameter Is The Size

14" Diameter 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

+ Product Details Size – 30" x 32" or 32" x 30" is the size for the duct opening measurement only

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

[Outer Dimensions: 38

30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille w36h36 14" Diameter Is The Size+ 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