The Helios VK 450 is a flat-design overpressure shutter engineered for efficient ventilation control. It automatically opens when the fan is running and closes upon shutdown, preventing unwanted backflow and maintaining system integrity.
Capable of handling airflow velocities up to 8 m/s, the shutter ensures reliable performance under typical ventilation conditions. The number of louvres adjusts according to the shutter size to provide optimal airflow management. This accessory is ideal for residential and commercial ventilation systems requiring dependable backdraft protection.