24" x 36" or 36" x 24" Cube Core Eggcrate Return Air Grille 12" Diameter + Product Details Size –

+ Product Details Size – 20" x 30" or 30" x 20" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 8 5/8" height

Filter Size - 19

actual front end outer dimensions are approximately 34 5/8" width X 16 5/8" height

24" x 36" or 36" x 24" Cube Core Eggcrate Return Air Grille 12" Diameter + Product Details Size –+ Product Details Size 24" x 36" or 36" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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