8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille sidewall Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 7 3/4" x 1"

+ Product Details Size - 32"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Grille sidewall Actual Filter Size – 21+ Product Details Size 8" x 34" or 34" x 8" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 9. 75" X 35. 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