The Helios Fans RVE 160 is designed for quick and simple retrofitting by inserting it directly into existing ventilation pipes. It consists of a durable plastic ring with an all-around double lip seal, ensuring a secure and airtight fit. The valve is equipped with a tight-fitting rubber membrane that opens in response to either negative or positive pressure, allowing controlled airflow. Two membranes with different flow rates are included to accommodate various ventilation needs. For installations with horizontal airflow, the web holding the rubber membrane should be positioned vertically to ensure proper operation. The RVE 160 operates efficiently within a temperature range of ‑20°C to +90°C, making it suitable for diverse environmental conditions.