Part F ventilation flow-rate testing
Part F Extractor Fan Testing
Check how your ventilation performs once it is installed. We measure extract airflow and provide clear testing evidence for your project team and Building Control.
Practical support for new homes, extensions, conversions and refurbishments across Lincolnshire and the East Midlands.
Calibrated equipment · Direct contact · Combined air-test visits where practical
Discuss your project →
What you receive
Measured performance, useful answers.
On-site airflow checks
We measure the installed extract rates at the relevant fans or terminals using calibrated airflow equipment.
Clear test results
A report recording the measured performance, providing evidence for your project team and Building Control.
Practical next steps
If a reading is below the required rate, we explain the findings so your installer can investigate and address the issue.
Feedback on the Barlings service
“A fantastic, professional company to work with. Great communication and turnaround time.”Chris Henderson · Barlings KWA client
Before we visit
Get the system ready for testing.
Testing is normally carried out close to completion, once the ventilation installation is complete and operational.
Installation complete
- Fans installed and powered.
- Ductwork complete and connected.
- Internal terminals and external vents fitted.
Access and information ready
- Access to the rooms and terminals being tested.
- Fan controls and boost settings available.
- System details and required flow rates available where known.
Why the installed result matters
A running fan may still underperform.
Ductwork
Long runs, tight bends and crushed or restricted ducting can reduce airflow.
Grilles and terminals
Blocked, restrictive or poorly fitted terminals can affect the installed performance.
Settings and installation
Incorrect boost settings or a fan unsuited to the duct arrangement can produce disappointing readings.
Testing measures what the system actually delivers, rather than relying only on the manufacturer’s stated fan performance.
A straightforward process
Arrange the visit, measure, then review.
Tell us about the property
Send the postcode, number of dwellings, ventilation system details and preferred testing date.
Complete the site visit
With the system operational and accessible, we measure the agreed fans or extract terminals.
Receive the findings
We provide the measured results and discuss any issues that need attention before further testing.
Useful answers before you enquire
Your extractor fan testing questions.
Can you carry this out with an air tightness test?
Often, yes. Tell us you need both services so we can discuss a combined visit where practical. View our air tightness testing service.
Which rooms are usually tested?
Extract ventilation is commonly installed in kitchens, bathrooms, shower rooms, utility rooms and WCs. The test scope depends on the property and its ventilation system.
When should I book the test?
Near completion, once the fans, ductwork and terminals are installed and powered. Contact us in advance to discuss readiness and availability.
Is this the same as an air tightness test?
No. Air tightness testing measures leakage through the building envelope. Ventilation flow-rate testing measures the airflow delivered by the installed ventilation system.
What happens if a fan does not achieve the required rate?
We explain the readings so your installer can investigate the fan settings, ductwork and terminals. Remedial work and any repeat testing can then be arranged.
Which Part F guidance applies to my project?
The relevant edition depends on the project’s regulatory arrangements. We can discuss the required testing evidence with your project team. View the official Approved Document F guidance.
Your project, your quotation
Arrange your ventilation testing.
Tell William and Kerry about the property, the ventilation system and your target date. We’ll confirm the testing scope and provide a quotation.
Useful details: postcode · number of dwellings · system type · number of fans or terminals · preferred date