28" x 28" Cube Core Eggcrate Return Air Grille return grille + Product Details Size -

+ Product Details Size - 20"w X 2"h is the size for the duct opening measurement only

Actual Filter Size – 11 3/4"w x 13 3/4" x 1"

+ Product Details Size - 14"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

28" x 28" Cube Core Eggcrate Return Air Grille return grille + Product Details Size -+ Product Details Size 28" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 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 electric