12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille return filter See our separate listing of

See our separate listing of T-Bar Supply Grilles

actual front end outer dimensions are approximately 16 5/8" width X 34 5/8" height

+ Product Details Size - 18"w X 4"h is the size for the duct opening measurement only

For 10" Round Duct Opening - Spiral or Flex

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Grille return filter See our separate listing of+ 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