18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring } /* ICON */ #hvac-product-accordion

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actual front end outer dimensions are approximately 27 5/8" width X 16 5/8" height

Design – rigid gauge built for durability and long life in mind

Perfect for both residential and commercial use

18" x 26" or 26" x 18" Cube Core Eggcrate Return Air Grille Round Damper Ring } /* ICON */ #hvac-product-accordion+ 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