6" x 32" or 32" x 6" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Details Size –

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 31 3/4" x 1"

And One Towards The Bottom Of The Door

Looks like it was just waxed

6" x 32" or 32" x 6" Cube Core Eggcrate Return Air Grille 18" Diameter + Product Details Size –+ Product Details Size 6" x 32" or 32" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 8. 5" X 34. 5". 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