10" x 30" or 30" x 10" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size –

+ Product Details Size – 15" Wooden Corner Baseboard Grille

Exceptional Craftsmanship: Hand-inspected for quality

Some of the best features aren't readily apparent

+ Product Details Size - 18"w X 36"h is the size for the duct opening measurement only

10" x 30" or 30" x 10" Cube Core Eggcrate Return Air Grille w20h20 + Product Details Size –+ Product Details Size 10" x 30" or 30" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 31. 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