18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white Design – Removable door/face for

Design – Removable door/face for easy filter change & cleaning - uses a 1" thick filter

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 24 5/8" width X 8 5/8" height

please note that the total outer dimensions of the grille measure 7" in diameter

18" x 28" or 28" x 18" Cube Core Eggcrate Return Air Grille white Design – Removable door/face for+ Product Details Size 18" x 28" or 28" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 29. 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