is a European Standard that has been adopted as a British Standard. Its full title is: "Drainage channels for vehicular and pedestrian areas – Slotted top surfaces and/or gratings – Requirements, testing and marking."
This standard is titled "Gas turbines and gas turbine sets — Measurement of emitted airborne noise — Engineering/survey method." It specifies methods for measuring sound pressure levels to calculate the sound power level produced by gas turbines and gas turbine sets. It is important to note that this standard is now and has been replaced by BS ISO 10494. If your work involves acoustic engineering rather than construction materials, this is the standard you would need. bs en 7721 pdf
BS EN 772 is a comprehensive series of test methods for masonry units, and you are likely interested in its most widely used parts. The following sections provide a detailed analysis of the key parts of this series, starting with the most probable focus of your search. is a European Standard that has been adopted
