18" x 18" Cube Core Eggcrate Return Air Grille RV Mobile Home + Product Details Size –

+ Product Details Size – 4"w X 14"h is the size for the duct opening measurement only

The 1/2" black insulation

and its seamless drop-in installation process ensures effortless setup

During summer

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18" x 18" Cube Core Eggcrate Return Air Grille RV Mobile Home + 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