20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Details Size –

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

Installation of the vents will eliminate the need to raise the door ensuring security and constant air flow and reduced heat transfer into attics and adjacent house walls

Smooth Surface Edges - Run Your Fingers Across The Surface To Feel The Smoothness

+ Product Details Size - 24"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 17 3/4" x 1"

20" x 32" or 32" x 20" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Details Size –+ Product Details Size 20" x 32" or 32" x 20" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 75" X 33. 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