30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

Actual Filter Size – 31 3/4"w x 25 3/4" x 1"

+ Product Details Size – 20" x 36" or 36" x 20" is the size for the duct opening measurement only

+ Product Details Size – 28" x 30 or 30" x 28" is the size for the duct opening measurement only

30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in actual front end outer dimensions+ Product Details Size 30" x 34" or 34" x 30" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 32. 5" X 36. 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