18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size -

+ Product Details Size - 30"w X 14"h is the size for the duct opening measurement only

Every part is hand inspected for quality before it is packaged

+ Product Details Size - 18"w X 36"h is the size for the duct opening measurement only

16" Diameter Is The Size For The Duct Opening Measurement Only

Actual Front End Outer Dimensions Are 12" Width X 8" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille w6h6 + Product Details Size -+ Product Details Size 18" x 26" or 26" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 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