16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Grille Insulated Line Set Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 31 3/4" x 1"

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

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

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

actual front end outer dimensions are approximately 28 5/8" width X 32 5/8" height

16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Grille Insulated Line Set Actual Filter Size – 13+ 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