14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille White Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

The process is intuitive: simply select the appropriate ceiling square for your grill

+ Product Details Size – 20" x 26 or 26" x 20" is the size for the duct opening measurement only

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 18"h X 2"d (for duct opening measurement only)

14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille White Actual Filter Size – 17+ Product Details Size 14" x 36" or 36" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 37. 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