The Sentinel D‑Box Twin Fan 150mm (Stock Ref: SENT150T) is a commercial demand ventilation unit engineered for reliable airflow management. Suitable for duct sizes ranging from 100mm to 500mm, it delivers airflow between 0.001 and 1.3 m³/s and pressures up to 650 Pa. Equipped with energy-saving EC/DC motors and a lockable isolator, the fan provides efficient performance with simple maintenance. Its sturdy Aluzinc construction makes it appropriate for both indoor and outdoor installations. Manufactured according to BS EN ISO 9001 standards and tested to BS848 Part 1 & 2, this unit ensures dependable, energy-efficient ventilation for various commercial settings.