The BIFA Single Phase 4 Pole 20° 400mm bifurcated case axial fan is engineered for commercial ventilation applications. Available in diameters from 250mm to 1000mm, it features an IP55-protected motor with Class ‘F’ insulation, capable of operating in ambient temperatures up to 200°C. Fan speed can be controlled via transformer or inverter when the surrounding air temperature does not exceed 60°C. The fan includes an IP55 terminal box and is suitable for environments with relative humidity up to 95%. Manufactured according to BS EN ISO 9001:2015 and performance tested to BS 848 parts 1,2 and ISO 5801, this fan combines reliability with long-lasting efficiency, supported by a 2‑year guarantee.