8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -

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

+ Product Details Size – 28" x 36" or 36" x 28" is the size for the duct opening measurement only

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

Crafted from high-quality aluminum

+ Product Details Size - 26"w X 12"h is the size for the duct opening measurement only

8" x 26" or 26" x 8" Cube Core Eggcrate Return Air Grille Return Grille + Product Details Size -+ Product Details Size 8" x 26" or 26" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 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