The louvered shutter is the oldest shutter style and to this day is still the most popular. In fact when most people hear the term "shutters", louvered shutters are what first come to mind. Louvers are horizontal slats that are angled to control the amount of light and air that can pass through. Louvered shutters mounted on functional shutter hinges are one of the few shutter styles that allow light to pass through when closed - which makes them ideal for both solar control and home energy efficiency. However, even if louvered shutters are only installed for decorative purposes they still provide a unique look that most homeowners love. Modern exterior louvered shutters typically come with fixed louvers which means there are no moving parts that can break over time.