18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w26h26 actual front end outer dimensions

actual front end outer dimensions are approximately 27 5/8" width X 26 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 6" duct openings

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

18" x 36" or 36" x 18" Cube Core Eggcrate Return Air Grille w26h26 actual front end outer dimensions+ Product Details Size 18" x 36" or 36" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 37. 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