28" x 28" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper 75"H – fits a 20"

75"H – fits a 20" X 8" duct opening

Actual Filter Size – 27 3/4"w x 23 3/4" x 1"

[Outer Dimensions: 26

actual front end outer dimensions are approximately 27 5/8" width X 12 5/8" height

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

28" x 28" Cube Core Eggcrate Return Air Grille Fixed Blades with Damper 75"H – fits a 20"+ 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