The Helios Fans RSD 250/300 is a compact, high-efficiency duct silencer designed to reduce noise in ventilation and air handling systems. It is built with a robust galvanized sheet steel housing and internally lined with high-quality mineral wool for superior acoustic performance. To protect against wear and fiber release, the airflow side is reinforced with a durable fleece layer.
Engineered for compatibility, the silencer’s dimensions and mounting hole circle correspond to standard fan diameters (R 20) and follow the hole pattern requirements of DIN 24155. With its minimal flow resistance, the RSD 250/300 ensures both quiet operation and efficient airflow, making it ideal for HVAC applications where space and performance are critical.