Dayton square control dampers provide a positive shutoff & regulate the volume of air passing through duct systems. These dampers feature extruded aluminium / galvanised steel frame for preventing damage against highly abrasive environments. Selected models feature symmetrical opposed blade configuration for modulating airflow in either direction. Choose from an extensive range of these volume control dampers, available for 10, 12, 16, 18 & 24 inch duct widths.