20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Black + Product Details Size –

+ Product Details Size – 32"w X 8"h is the size for the duct opening measurement only

Say goodbye to vibrating louvers - this grille ensures a quiet

+ Product Details Size - 18"w X 16"h is the size for the duct opening measurement only

+ Product Details Size – 20" x 24" or 24" x 20" is the size for the duct opening measurement only

+ Product Details Size – 30"w X 30"h is the size for the duct opening measurement only

20" x 36" or 36" x 20" Cube Core Eggcrate Return Air Grille Black + Product Details Size –+ Product Details Size 20" x 36" or 36" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 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