Vent Testing Explained

What is a vent test?

Ventilation extract testing or Part F vent testing is carried out on a dwelling’s ventilation systems. To confirm the installed systems are achieving the required flow rates as required by Part F of the building regulations. ​

A test involves one of our accredited team of BPEC testing engineers to test the installed extractor fans within the dwelling using specialist UKAS calibrated testing equipment and measure the flow rates of each of the fans. The testing is usually carried out during the same visit as the air permeability making it more cost effective. The test results are confirmed onsite and certificates are issued same day.

Why test?

With a greater pressure by building performance standards to lower the amount of uncontrolled air movement, dwellings are becoming ever increasingly air tight. This means that it is very important that the intended air movement within a dwelling is actually achieved. As a result of this, 2010 Part F of the building regulations recognised the need to onsite test extract fans to ensure that they are achieving the correct flow rates. Since then we have been working with large and small developers to help them achieve this requirement.

What should I target for my score? 

Whilst the maximum result can be upto 10m³/hr/m² here at BEAT Solutions we recommend a target of 5m³/hr/m² @ 50 pascals. This represents a modest score which is slightly better than the national average and is very achievable without the need for specilaist products. Additionally, the this score will help lower the buildings CO² emissions, help reduce running costs and improve the SAP or SBEM calculation score for building regulation compliance.


If yours interested in lowering your target score even more, we offer a detailed design review service which will help ensure your buildings design is airtight.

How to prepare for a vent test?

guidance on proper design

guidance of ductwork

guidance of fan selection

guidance on grilles and terminals

When is the vent test done?

The testing should be conducted once the building is complete and prior to occupation.

We therefore recommend the test is booked once the property is nearing completion. This is often at a similar time to the finals and cleaning stage. Importantly the property must have the electricity supply on and all the extract fans and controls properly working including any room terminals or external grilles installed.  

Use our vent testing readiness checklist to ensure your next project gets the best possible result.