12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille Insulated Line Set + How To Measure A

+ How To Measure A Round Vent Overall Size:

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 23 3/4" x 1"

actual front end outer dimensions are approximately 27 5/8" width X 32 5/8" height

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Grille Insulated Line Set + How To Measure A+ Product Details Size 12" x 36" or 36" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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