Ortech BDA-4 Back draft damper for airflow control in ventilation systems

For mounting between ducts The damper is installed by sliding between two ducts Capable of functioning in both horizontal and vertical positions When mounted, damper prevents back draft when the fan stops; temperature usage up to +50ºC Aluminum blades will open when blades are exposed to pressure and will shut again when pressure drops Its mechanical spring is sealed with a rubber (neoprene) gasket, which helps opening and shutting of the aluminum blades