With more awareness of noise issues and many developments occurring in already built-up areas it is essential to provide an
accurate specification of the noise emitted by building services equipment. Acoustic testing is important to manufacturers
as it enables them to provide useful data about the noise emitted by their product. Acoustic data enables specifiers to make
an informed decision when selecting a product for installation. The aim of this publication is to explain what is being measured
to obtain acoustic data and why acoustic data is important and useful. Some examples of product data sheets are used to demonstrate
both good and bad practice when stating acoustic data for a product. References are made to current standards and legislation.