BS EN 17166. Fans. Procedures and methods to determine the energy efficiency for the electrical input power range of 125 W up to 500 kW|Temperature measurement, Mathematical calculations, Fans, Classification systems, Ventilators, Extraction fans, Accuracy, Performance, Pressure measurement (fluids), Performance testing, Power measurement, Reproducibility, Ducted fans, Industrial, Testing conditions, Air, Flow measurement, Flowmeters, Velocity measurement, Flow rates, Test equipment, Precision