The Sentinel D‑Box Twin Fan 125mm (Stock Ref: SENT125T) is a high-performance demand ventilation unit ideal for commercial use. It accommodates duct sizes from 100mm to 500mm, providing 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, this fan ensures efficient operation and simple maintenance. Constructed from durable Aluzinc, it can be installed internally or externally. Manufactured under BS EN ISO 9001 standards and performance-tested to BS848 Part 1 & 2, the Sentinel D‑Box Twin delivers dependable, energy-efficient ventilation for commercial environments.