18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood + Product Details Size –

+ Product Details Size – 16" x 16" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 32" OR 32" x 26" duct opening (measured at the opening)

6"w X 6"h 3-Way Fixed Curved Blade Air Supply Diffuser - Vent Duct Cover - Grille Register - Sidewall or Cieling - High Airflow - White

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

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18" x 20" or 20" x 18" Cube Core Eggcrate Return Air Grille Color_Red Oak Wood + Product Details Size –+ Product Details Size 18" x 20" or 20" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 21. 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