30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are approximately 36 5/8" width X 34 5/8" height

+ Product Details Size – 10" x 18" or 18" x 10" is the size for the duct opening measurement only

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 21 3/4" x 1"

30" x 34" or 34" x 30" Cube Core Eggcrate Return Air Grille Compatible With Duct 6in Actual Filter Size – 25+ 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