12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_Red Oak + Product Details Size –

+ Product Details Size – 26"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 24 5/8" height

For 8" Round Duct Opening - Spiral or Flex

actual front end outer dimensions are approximately 36 5/8" width X 18 5/8" height

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille Color_Red Oak + Product Details Size –+ Product Details Size 12" x 22" or 22" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 23. 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