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This document establishes a system for the classification of fan efficiency for all fan types driven by motors with an electrical input power of 0,125 kW and above. It applies to driven fans only, but not to the system (finished original equipment manufacturer’s product, for example box fans and roof fans or ventilation system) in which they might be installed. This document, as well as ISO 12759-3, ISO 12759-5 and ISO 12759-6, describe a number of different procedures to classify the efficiency of a fan or to apply a minimum efficiency limit (MEL).
Appendix F shows how procedures described in this document can be used to set MELs. There is no method described to compare these classifications and MELs.
NOTE 1 The electrical input power is at the fan’s optimum efficiency.3.17
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conventional output power which is the product of the mass flow rate and fan static work per unit mass, or the product of the inlet volume flow rate, the compressibility coefficient and the fan static pressure.
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