18" x 18" Cube Core Eggcrate Return Air Grille Ceiling + Product Details Size –

+ Product Details Size – 6" x 24" or 24" x 6" is the size for the duct opening measurement only

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only measure the "hole" in the wall/duct

Width vs Height:

18" x 18" Cube Core Eggcrate Return Air Grille Ceiling + Product Details Size –+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" width X 19. 75" height. High Quality High quality rust free, strong aluminum construction with smooth finished edges for easy and safe use; Filter Grille features a user friendly plastic latch that requires no screwdriver for opening. Installation Location sidewall and ceiling. Design Cubic core eggcrate