For most of the product manufactured for the heating, ventilation and air conditioning industry no specific test code existed for the assessment of the noise levels generated by these products. Consequently, it was often not possible to compare the noise levels of different products on a realistic basis, or reliably estimate the noise levels of such products when installed in their operating environment. This test code was prepared in order to provide a reasoned means of comparison between products and to enable purchasers of such equipment to estimate the noise levels which would be generated by the installed equipment. This document is available only in English.