16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Grille + Product Details Size -

+ Product Details Size - 12"w X 14"h is the size for the duct opening measurement only

8-1/8"H x 4-5/8" W x 3-5/8"D

+ Product Details Size – 26"w X 24"h is the size for the duct opening measurement only

Ring Base Design – Allows for easy installation without removing the thermostat

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Grille Grille + Product Details Size -+ Product Details Size 16" x 26" or 26" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 75" X 27. 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