24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Return Grille Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 29 3/4" x 1"

+ Product Details Size – 18"w X 20"h is the size for the duct opening measurement only

this grille seamlessly drops into the designated place

This versatile guard features air circulating ports on all four sides to allow proper airflow

24" x 26" or 26" x 24" Cube Core Eggcrate Return Air Grille Return Grille Actual Filter Size – 13+ Product Details Size 24" x 26" or 26" x 24" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 25. 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