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Domestic Ventilation Systems - a guide to measuring airflow rates (BG 46/2015)


With recent improvements in dwelling airtightness and increased use of systems such as MVHR, getting the ventilation right in dwellings is important. In 2010, mechanical ventilation air flow rate testing became part of the England and Wales Building Regulations.

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With the improvements in dwelling airtightness over the past few years, and increased use of systems such as Mechanical Ventilation with Heat Recovery (MVHR), getting the ventilation right in dwellings has become more critical. In 2010, a requirement for mechanical ventilation air flow rate testing in dwellings was written into the England & Wales Building Regulations.

This BSRIA guide was first published in 2013, describing the conditional and unconditional methods of airflow measurement. The 2015 edition also describes a third method, the minimum benchmark method. 

Contents include:

  • Types of ventilation systems
  • Performance requirements
  • Design and installation
  • Airflow measurement – conditional, unconditional and minimum benchmark methods
  • Testing and commissioning

The test work to support the methodology recommended in this guide was undertaken independently by BSRIA. Read report


Publication details

AuthorChris Knights and Alan Gilbert
No. of pages22
Number of books in set1
Date publishedJanuary 2015


If you have any specific questions about this publication please contact our Publications Manager David Bleicher on +44 (0)1344 465529 or david.bleicher@bsria.co.uk

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