ActronAir Zone Barrel Assembly 16 inch (400mm) is a 24VAC motorised zone damper for ActronAir ducted zoning systems, with a 3Nm motor providing drive open and drive close operation, 10mm fire-rated polyethylene insulation, and a 7m RJ45 CAT5E cable supplied as standard. A failed zone barrel prevents airflow to that zone, causing uneven temperature distribution and potential pressure issues in the duct system — fit the 100% Genuine ActronAir ZB-16-400 to restore factory zone performance. Carries a 5-year parts and labour warranty when installed with a new ActronAir system.