10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe + Product Details Size -

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 16"h is the size for the duct opening measurement only

Actual Front End Outer Dimensions Are 13

gymnasiums & restaurants

32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

10" x 18" or 18" x 10" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe + Product Details Size -+ Product Details Size 10" x 18" or 18" x 10" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 11. 75" X 19. 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