18" x 18" Cube Core Eggcrate Return Air Grille w20h20 addEventListener('click'

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+ Product Details Size - 6"w X 6"h is the size for the duct opening measurement only

provides a modern look and quiet operation due to its half-inch by half-inch cube design

75" width X 21

18" x 18" Cube Core Eggcrate Return Air Grille w20h20 addEventListener('click'+ 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