30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille Color_Aluminum Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 21 3/4" x 1"

actual front end outer dimensions are approximately 22 5/8" width X 12 5/8" height

+ Product Details Size – 22" x 36" or 36" x 22" is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 11 3/4" x 1"

Actual Filter Size – 19 3/4"w x 19 3/4" x 1"

30" x 36" or 36" x 30" Cube Core Eggcrate Return Air Grille Color_Aluminum Actual Filter Size – 33+ Product Details Size 30" x 36" or 36" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32. 5" X 38. 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