10" x 28" or 28" x 10" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe 6" width X 7

6" width X 7

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+ Product Details Size – 30"w X 12"h is the size for the duct opening measurement only

R value rating of insulation - R3

For 12" Round Duct Opening - Spiral or Flex

10" x 28" or 28" x 10" Cube Core Eggcrate Return Air Grille 10" Round Duct Pipe 6" width X 7+ Product Details Size 10" x 28" or 28" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 29. 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