The Sentinel D‑Box Twin Fan 125mm (Stock Ref: SENT125T) is a commercial demand ventilation unit designed for efficient airflow management. It supports duct sizes from 100mm to 500mm, delivering airflow from 0.001 to 1.3 m³/s and pressures up to 650 Pa. The fan features energy-saving EC/DC motors and a lockable isolator for safe and efficient operation. Its robust Aluzinc construction allows for both internal and external installation. Manufactured to BS EN ISO 9001 standards and performance-tested to BS848 Part 1 & 2, this unit ensures reliable and energy-efficient ventilation for commercial environments.