6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Compatible with Duct 8" Actual Filter Size – 19

Actual Filter Size – 19 3/4"w x 24 3/4" x 1"

+ Product Details Size - 16"w X 16"h is the size for the duct opening measurement only

For 14" Round Duct Opening - Spiral or Flex

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Grille Compatible with Duct 8" Actual Filter Size – 19+ Product Details Size 6" x 36" or 36" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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