8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille RG66 Black-HP + Product Details Size –

+ Product Details Size – 36"w X 28"h is the size for the duct opening measurement only

The installation process is a breeze

actual front end outer dimensions are approximately 12 5/8" width X 20 5/8" height

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

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

8" x 28" or 28" x 8" Cube Core Eggcrate Return Air Grille RG66 Black-HP + Product Details Size –+ Product Details Size 8" x 28" or 28" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 29. 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