GRAVITY DAMPER One of the possible elements of the outlet end point of the ventilation system, the operation of which is ensured by the air movement created by the air flow generating unit (e.g. fan, hood, etc.) placed in the system. When the unit placed in the system is operating, the formwork is in an open state, and then closes after it stops. It protects the system from external influences and from possible reverse air flow. Can be used: for ventilation systems with the same connection size and rectangular cross-section. Frame: plastic Formwork: plastic