The Helios RR 150 B is a robust inline centrifugal fan designed to deliver reliable ventilation performance through duct systems up to 315mm in diameter. Engineered for high-pressure development, this fan effectively maintains airflow even in systems with higher than expected resistance. It is ideal for use with both flexible and spiral ducting in a wide range of ventilation applications. The fan is housed in a durable structure and is easy to install, with a straightforward mounting solution using the optional MK4 foot and pipe clamps for quick duct connections. The RR 150 B offers a practical and economical solution for maintaining strong airflow across moderate duct lengths.