The Sentinel D‑Box Twin Fan 400mm (Stock Ref: SENT400T) is designed to deliver efficient and reliable ventilation for commercial applications. Built to accommodate duct sizes between 100mm and 500mm, it provides airflow rates from 0.001 to 1.3 m³/s and can handle pressures up to 650 Pa. This demand-controlled unit features the latest EC/DC motors for enhanced energy efficiency, along with a lockable isolator for added operational safety. Its durable Aluzinc construction ensures long-lasting performance and suitability for both internal and external installation. Manufactured under BS EN ISO 9001 quality standards and tested to BS848 Part 1 & 2, the Sentinel D‑Box Twin 400mm is a dependable solution for modern commercial ventilation systems.