Addendum – 10/2016
The Building Regulations 2010, Statutory Instrument Part 9, paragraph 42, imposes a requirement
that testing and reporting of mechanical ventilation performance is conducted in accordance with an
approved procedure.
Compliance with this requirement by an assessed and registered ‘Competent Person’ should follow a
‘Best Practice’ process and adopt air flow measurement, Method A – The Unconditional Method –
using a suitable UKAS certified measuring instrument. Generically referred to as a ‘Zero Pressure
Air Flow Meter’ or ‘Powered Flow Meter’.
Further information on this method is detailed in NHBC Building Regulations Guidance Note G272a
10/13 and BSRIA ‘A Guide to Measuring air flow rates’ document BG46/2015
