The BIFA Single Phase 4 Pole 18° 315mm fan is part of the BIFA bifurcated case axial fan series, designed for commercial ventilation systems. It is available in diameters from 250mm to 1000mm and features motors protected to IP55 standards with Class ‘F’ insulation, suitable for operation in ambient temperatures up to 200°C. Fan speed can be controlled via a transformer or inverter when the surrounding air temperature does not exceed 60°C. The unit includes an IP55-rated terminal box and operates effectively in environments with relative humidity up to 95%. Manufactured to BS EN ISO 9001:2015 standards, its performance is tested according to BS 848 parts 1 and 2 and ISO 5801. The fan comes with a 2‑year guarantee.