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

actual front end outer dimensions are approximately 27 5/8" width X 34 5/8" height -

+ Product Details Size - 22"w X 6"h is the size for the duct opening measurement only

These are specially sized to fit into all drop ceilings

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

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