For medium-sized rooms in need of fresh, natural light, consider the Skytube 400 tubular skylight. With an attractive low-profiled roof dome, Skytube 400 will transfer natural light into the room below, making it brighter, fresher and more inviting. The light is transferred from the dome to the room below using a reflective flexi-shaft. The stylish ceiling diffuser allows ventilation to be controlled at the ceiling level. It has three positions: closed, half vent and full vent.