The Sentinel D‑Box Twin Fan 100mm (Stock Ref: SENT100T) is designed for commercial demand ventilation systems, handling duct sizes from 100mm up to 500mm. It provides airflow between 0.001 and 1.3 m³/s with pressures up to 650 Pa. Fitted with advanced energy-saving EC/DC motors and a lockable isolator, this fan delivers efficient performance and easy maintenance. Its Aluzinc construction allows for both internal and external installation. Manufactured to BS EN ISO 9001 standards and tested to BS848 Part 1 & 2, the Sentinel D‑Box Twin ensures reliable, high-quality ventilation for commercial applications.