The COVER PLATE seals the vents on the helmet stopping airflow into the vents. This also prevents dirt and debris from entering your helmet. The models BR8/BR8 Carbon offers five options to direct airflow to the driver based on their preference including: left side chin bar, right side chin bar, ¾ left side, ¾ right side, and top. COVER PLATES are designed to seal off the vent locations depending on the configuration. When used with in a forced air configuration, the Cover Plates pressurize the helmet and prevent airflow from escaping from the open vent.