The Helios Fans ZTV 80 is a thermostatic ventilation valve made from durable white impact-resistant polymer. It includes an internal sound-absorbing insulation film designed to prevent condensation buildup within the valve. A built-in temperature sensor automatically adjusts the valve opening in response to temperature changes, independent of external conditions. The sensor operates within a range from ‑5°C to +35°C. The valve also provides sound attenuation between 30 and 35 dB, ensuring quiet and efficient airflow regulation.