What is ISO 12759‑4 - Fans about?
ISO 12759 is a series on fans. A fan is a powered machine used to create a flow of air. ISO 12759‑4 establishes a system for the classification of fan efficiency for all fan types driven by motors of nominal rating 0,125 kW and above. ISO 12759‑4 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. ISO 12759‑4 describes a number of different procedures to classify the efficiency of a fan or to apply a minimum efficiency limit (MEL). Those procedures are described in:
- ISO 12759-3
- This document (ISO 12759-4)
- ISO 12759-5
- ISO 12759-6
Who is ISO 12759‑4 - Fans for?
ISO 12759‑4 on fans is useful for:
- Fan manufacturing industries
- Design engineers
- Quality control personnel
Why should you use ISO 12759‑4 - Fans?
A fan consists of a rotating arrangement of vanes or blades, generally made of wood plastic or metal, which act on the air. The last decade has seen an escalation in the price and increasing recognition of the finite life of many of the fossil fuels currently used. There is also a belief by many that climatic change is due to increasing levels of carbon dioxide in the atmosphere. This has led to many nations reviewing methods of energy generation and usage. To maintain economic growth there is, therefore, a need to promote energy efficiency. This requires a better selection of equipment by users and thus better design of this equipment by manufacturers in large quantities.
ISO 12759‑4 introduces fans of all types that are used for ventilation, air conditioning, process engineering – drying, pneumatic conveying – combustion air supply and agriculture. Indeed, the energy use of fans has been calculated to account for nearly 20 % of the global electricity usage. To encourage fans implementation, a classification system is proposed which incorporates a series of efficiency bands. With improvements in technology and manufacturing processes, the minimum efficiency levels could be reviewed and increased over time. Fans range from the purpose-built single fan to the series-produced certified ranges manufactured in impeller casing if so, supplemented by a volume control such as a variable speed control or guide vanes. Using ISO 12759‑4 you understand the maximum operating speed efficiency of a driven fan.
