6" x 26" or 26" x 6" Cube Core Eggcrate Return Air Grille White + Product Details Size -

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

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

actual front end outer dimensions are approximately 30 5/8" width X 16 5/8" height -

Example: If your hole is 20" wide by 14" tall

8" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

6" x 26" or 26" x 6" Cube Core Eggcrate Return Air Grille White + Product Details Size -+ Product Details Size 6" x 26" or 26" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 75" X 27. 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