Extract Testing

Extract Testing

Building Regulations Part F - Extract Testing

We are privileged to be one the first to provide extract testing throughout the UK with specialist advice on achieving compliance and how best resolve any potential problems.


Numerous building controls are now asking for extract testing and many will refer to the process as Testing of mechanical air flow rates or extractor fan testing this statement may be found under Part F of building regulations, however, if you are unsure please contact us or your local building control. 


Best Way to Achieve Compliance

  • At least one trickle vent per window or two for double windows in rooms where there is no extract.
  • Use the shortest possible ductwork path, utilising ridged ducting ideally to prevent any blockage.
  • The installation of modest / high power extracts.
  • At least a 10mm undercut for each internal door.
  • Avoid gravity shutter external grills.


Are There Minimum Rate I Need to Achieve?

Yes. Depending on the location within the dwelling and the facilities the room has will affect the rate required.

The targets for System 1 Extracts:

  • Utility - 30l/s
  • Kitchen Cooker Hood - 30l/s
  • Family Bathrooms and En-suites - 15l/s
  • Sanitary Accommodation, W/Cs - 6l/s

Other systems of extract exist and also have their own targets to reach, but System 1 is the most simple for compliance.


What Should I Do?

Before the test please ensure all trickle vents / extract fans and cooker hoods are installed and are working correctly. If the product is faulty this could make testing difficult.


What is the Importance of the Test?

As builders become comfortable on the requirements of achieving a low air test score it has increased the pressure on ensuring the correctly sized purpose ventilation systems are installed. For example, extracts units are placed within rooms where water vapour or pollutants are released it is important to remove them and stop the spread to the remaining house as long-term impacts could be dampness or mould which both affect a person’s health.

For more information on extract testing or the requirements regarding Building Regulation Part F please do not hesitate to contact us on 01476 870 504 or contact info@ashbyenergy.co.uk

Book your extract/extractor fan test and air test together and we can provide a reduction in price.

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