6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size –

+ Product Details Size – 12" x 12" is the size for the duct opening measurement only

Whilst the maximum pressure for R410 is 700 PSI

12"w X 4"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 21

6" x 30" or 30" x 6" Cube Core Eggcrate Return Air Grille Material_Aluminum + Product Details Size –+ Product Details Size 6" x 30" or 30" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 31. 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