A louver round-top is an architectural feature commonly used in windows, doors, and vents to control the flow of air and light while adding a decorative element to the building. It consists of a series of horizontal slats or blades arranged in a semi-circular shape at the top of the window or door frame. The round-top shape of the louver adds a distinctive and elegant touch to any building facade and is often used in traditional or classic architectural styles. Louver round-tops can also be used to create a decorative effect, such as in gables or dormers.