14x22 Inner Dome w/ Window Replacement RV Inner Skylight Dome Hole Dimensions 14" x 22", Flange Dimensions 16" x 23 1/2", Bubble Height Of About 5". Made of a durable polycarbonate material to keep it longer lasting from the sun's UV rays and fallen debris. To determine what skylight you need, measure the size of the rough hole opening in your roof. Skylights sit directly on your RV roof. If necessary an inner garnish is available to finish the inside hole. No metal flange is used with these single pane skylights. Use a skylight size that is equal to or greater than your hole dimensions.  Dome Type: Bubble Shape: Rectangular Opening Length (IN): 14 Inch Opening Width (IN): 22 Inch Flange Length (IN): 16 Inch Flange Width (IN): 23 1/2 Inch Color: White Material: Polycarbonate