12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Grille 12" Diameter + Product Details Size –

+ Product Details Size – 22"w X 26"h is the size for the duct opening measurement only

"Opposing" back blades

+ Product Details Size - 14"w X 34"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

12" x 16" or 16" x 12" Cube Core Eggcrate Return Air Grille 12" Diameter + Product Details Size –+ Product Details Size 12" x 16" or 16" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 17. 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