The Sentinel D‑Box Twin Fan 200mm (Stock Ref: SENT200T) is a high-performance commercial demand ventilation unit. It accommodates duct sizes from 100mm to 500mm, delivering airflow rates between 0.001 and 1.3 m³/s and pressures up to 650 Pa. Fitted with energy-saving EC/DC motors and a lockable isolator, this fan ensures efficient operation and easy maintenance. Its durable Aluzinc construction allows for both internal and external installation. Manufactured under BS EN ISO 9001 standards and performance-tested to BS848 Part 1 & 2, the Sentinel D‑Box Twin provides dependable and energy-efficient ventilation for a variety of commercial environments.