Swegon's Actionair SmokeCommand dampers.
These dampers meet the strict smoke control requirements by moving to an open or closed position less than 60 seconds after receiving an alarm and remaining open for up to 120 minutes for safe smoke extraction and increase evacuation time. They are able to maintain their position because they have no thermal device to cause uncontrolled operation and no automatic return mechanism.
SmokeCommand dampers play a critical role in extracting heat from a building and can complement the use of fire sprinklers in helping to manage the impact of a fire. Some dampers will be venting smoke and others closing to manage the movement of the smoke.