The Sentinel D‑Box Single Fan 125mm (Stock Ref: SENT125S) is a high-efficiency demand ventilation unit designed for commercial applications. It supports duct sizes from 100mm to 500mm, delivering airflow rates between 0.001 and 1.3 m³/s and pressures up to 650 Pa. Featuring low-energy EC/DC motors with backward curved impellers and a lockable isolator, it ensures efficient operation and easy maintenance. Its 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 fan provides reliable and energy-efficient ventilation for a range of commercial environments.