16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Grille Insulated Line Set + Product Details Size -

+ Product Details Size - 12"w X 4"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 38 5/8" height

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

Actual Filter Size – 21 3/4"w x 35 3/4" x 1"

16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Grille Insulated Line Set + Product Details Size -+ Product Details Size 16" x 34" or 34" x 16" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 17. 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