26" x 36" or 36" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size –

+ Product Details Size – 10" x 22" or 22" x 10" is the size for the duct opening measurement only

and installation is quick and simple with the included screws

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 28 5/8" width X 36 5/8" height

Actual Filter Size – 25 3/4"w x 25 3/4" x 1"

26" x 36" or 36" x 26" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size –+ Product Details Size 26" x 36" or 36" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 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