12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_Red Oak + Product Details Size –

+ Product Details Size – 20"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 26"w X 36"h is the size for the duct opening measurement only

this diffuser is the perfect blend of function and style for your home

+ Product Details Size - 8"w X 12"h is the size for the duct opening measurement only

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_Red Oak + Product Details Size –+ Product Details Size 12" x 22" or 22" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 23. 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