The Helios BTV 100 shutter is designed to prevent the transmission of fire and smoke in ventilation systems. It is suitable for installation in ventilation shafts or ducting that act as fire compartments, meeting the K90-4102 fire resistance classification. The shutter can be inserted into spiral ducting or installed in walls using the EH mounting sleeve. Maintenance-free and approved under certificate No. Z‑41.3 – 694, it provides reliable fire protection for ventilation applications.