The Sentinel D‑Box Single Fan 150mm (Stock Ref: SENT150S) is a high-efficiency demand ventilation unit designed for commercial applications. It supports duct diameters from 100mm to 500mm, providing airflow rates between 0.001 and 1.3 m³/s and pressures up to 650 Pa. Equipped with low-energy EC/DC motors and backward curved impellers, along with a lockable isolator, it delivers efficient performance and easy maintenance. The Aluzinc construction allows installation indoors or outdoors. Manufactured in accordance with BS EN ISO 9001 and performance-tested to BS848 Part 1 & 2, this fan offers reliable, energy-efficient ventilation for a variety of commercial environments.