The Event EBB100 is a basic single speed axial fan with anti-backdraught shutters and built in guide vanes to improve airflow. The on/off switch can be linked to the light switch or can be independent. The IP rated 24 fan can be located in Zones 1, 2 or Outside.Uses gravity to close the shutters when not in use to prevent a draught. The cheapest greenwood extractor fan. Suitable for walls and ceilings.