The BIFA Single Phase 4 Pole 28° 400mm bifurcated case axial fan is designed for commercial ventilation systems. Offered in sizes ranging from 250mm to 1000mm, it features a motor with IP55 protection and Class ‘F’ insulation, suitable for ambient temperatures up to 200°C. Fan speed can be controlled via transformer or inverter when the ambient air temperature does not exceed 60°C. Equipped with an IP55 terminal box, it is compatible with relative humidity levels up to 95%. Manufactured to BS EN ISO 9001:2015 standards and performance-tested to BS 848 parts 1,2 and ISO 5801, this fan delivers reliable and efficient airflow, backed by a 2‑year guarantee.