28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille + Product Details Size -

+ Product Details Size - 4"w X 34"h is the size for the duct opening measurement only

please note that the total outer dimensions of the grille measure 6" in diameter

actual front end outer dimensions are approximately 38 5/8" width X 10 5/8" height

These are specially sized to fit into all drop ceilings

and lay it flat in the grid

28" x 34" or 34" x 28" Cube Core Eggcrate Return Air Grille Grille + Product Details Size -+ Product Details Size 28" x 34" or 34" x 28" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 29. 75" X 35. 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