Brookvent 100mm | Metal Air Valve - Supply - Fire Rated - White

100mm White Fire-Rated Metal Air Valve designed to supply ventilated air. Suitable to connect to a 100mm/4inch Flexible duct. Rotating control disc to adjust airflow. 60 Minute Rating for Ceilings. Suitable with vent, fittings and grilles. Easy Use and Installation. Used in Bathroom/kitchen, with In-Line Fans, ductwork for whole house ventilation, HRV Sytems, MEV Systems and Positive Input Systems.