6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Curved Blade Steel box-shadow: 0 4px 8px rgba(0

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actual front end outer dimensions are approximately 32 5/8" width X 38 5/8" height

& EN 13180 standards

40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

actual front end outer dimensions are approximately 16 5/8" width X 14 5/8" height

6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Grille Curved Blade Steel box-shadow: 0 4px 8px rgba(0+ Product Details Size 6" x 18" or 18" x 6" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 7. 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