34" x 36" or 36" x 34" Cube Core Eggcrate Return Air Grille RG66 Black-HP Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 15 3/4" x 1"

+ Product Details Size – 20"w X 50"h is the size for the duct opening measurement only

these louvers provide exceptional protection against rain and water

+ Product Details Size - 32"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 14 5/8" width X 22 5/8" height

34" x 36" or 36" x 34" Cube Core Eggcrate Return Air Grille RG66 Black-HP Actual Filter Size – 11+ Product Details Size 34" x 36" or 36" x 34" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 35. 75" X 37. 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