Variable air volume rectangular dampers (VAV) Rectangular air flow damper for VAV installations. These dampers are used to adjust the air flow to a bypass or a room based on a 0-10 V signal provided by a controller of temperature. The command signal sent by the controller of the room, position the actuator to control the flow of the need the enclosure. A foam seal inside the perimeter of the damper seals the air in case of total closure order. You can change a posteriori the flow Vmin and Vmax using a remote control. Galvanized steel housing, cross differential pressure measurement aluminum, connect in ABS and measuring tubes the actuator in red / blue silicone. Damper foam seal from EPDM.