The Helios Fans ZLA 80 is a complete ventilation valve kit designed for installation in wall and ceiling openings. It consists of a thermostatic valve, telescopic wall sleeve, integrated air filter cassette, and a durable external shutter, all made from impact-resistant white polymer. The built-in temperature sensor automatically adjusts the valve opening independently of outdoor temperature, enhancing energy-efficient airflow control. The valve’s interior surface is coated to prevent condensation formation. Additionally, the unit provides sound attenuation between 30 and 35 dB, ensuring quiet operation in various ventilation applications.