The Monsoon Silence range is the latest innovative domestic ventilation solution, providing high extraction rates with low energy use and exceptionally quiet running levels. The casing and impeller are made of durable high-quality UV-resistant plastic. The stylish design makes the fan complement any modern interior. It operates at a low noise level as low as 25 dB(A), suitable for ZONE 1. Specific fan power is as low as 0.27 W/L/S. Available in 100 & 125mm IP45 (as long as RCD is present) and 150mm IPX4. This fan can be used with longer duct runs due to its mix-flow impeller, but ducting will affect the fan performance (see graphs). It features long-life ball bearing motors with a service life of 40,000 hours. Includes a back draught shutter as standard. Rubber anti-vibration mounts are designed for motor vibration absorption and noise insulation. Specially designed airflow vanes reduce air turbulence, boost air pressure, and lower noise levels. Complete with backdraught shutters to prevent backflow and heat loss. Complies with both Part F & L. Standard thermal overload protection on the motor. Residual Current Device.