26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille Grille if your hole is 20"

if your hole is 20" wide by 14" tall

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height

actual front end outer dimensions are approximately 20 5/8" width X 338 5/8" height

ensuring consistent temperature control

+ Product Details Size – 10" x 16" or 16" x 10" is the size for the duct opening measurement only

26" x 28" or 28" x 26" Cube Core Eggcrate Return Air Grille Grille if your hole is 20"+ Product Details Size 26" x 28" or 28" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 75" X 29. 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