Extractor Fan Flow Rate Testing
EPS Group provides Extractor Fan Flow Rate Tests (Ventilation Tests) for all new dwellings throughout England and Wales as a standalone service or inconjunction with our Air Tightness Testing service.
Our reliable and friendly Technicians are all BPEC or NICEIC certified and use UKAS calibrated equipment in order to accurately measure the extract rates of all installed intermittent fans against the minimum requirements of Part F of the Building Regulations.
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Contact Us Today for your Extract Flow Rate Testing Requirements!
Our highly experienced Technicians provide comprehensive guidance and support in order to help you achieve compliance with Part F of the Building Regulations.
We can complete you ventilation testing as a standalone service or in conjunction with our Air Tightness Testing services.
For more information relating to Extract Flow Rate Testing please explore the Frequently Asked Questions below.
What is Extractor Fan Flow Rate Testing?
Whilst sporadically enforced, Approved Document Part F of the Building Regulations requires all mechanical extract fans within a new dwelling to have a flow rate test in order to demonstrate that they meet a minimum performance standard. The results of this test should be passed to the Building Control Body.
The requirement to undertake flow rate testing extends to all ventilation system types and strategies including simple intermittent extract fans and whole house mechanical extract systems with heat recovery (MVHR).
Ventilation testing is becoming increasingly important as new homes are achieving lower air permeability rates as part of the overall drive towards building more efficient housing. As buildings become more airtight, it is vital that adequate ventilation systems are installed in order to avoid any potential damp and condensation issues.
Part F Ventilation Testing (Flow Rate Testing) should be undertaken by a BPEC or NICEIC qualified technician using UKAS calibrated equipment.
Extractor Fan Flow Rate Testing FAQs
What extract ventilation rate do intermittent extract fans need to achieve?
Table 5.1 of Approved Document Part F of the Building Regulations details the following minimum extract flow rates from any installed mechanical fans.
|Room||Minimum flow rate|
|Kitchens (adjacent to hob)||
30 l/s (If adjacent to hob)
60 l/s (elsewhere)
|Utility rooms||30 l/s|
|Sanitary accommodation||6 l/s|
At EPS Group, we provide extract flow rate tests using UKAS calibrated anemometers in accordance with the Minimum Benchmark Method. This is one of three authorised methods for testing domestic ventilations systems as outlined within the ‘Domestic ventilation compliance guide’.
Under the Minimum Benchmark Method, a correction factor is applied to the required flow rate standards in order to take account of any loss of performance which may be experienced as a result of taking flow rate measurements taken with an anemometer. As a consequence, the following minimum measured extract flow rates are deemed to be a reasonable indication of compliance with Table 5.1 of Approved Document Part F and should therefore be accepted by the appointed Building Control Body.
|Fan Rating||Minimum benchmark performance|
|15 l/s||12 l/s|
|30 l/s||24 l/s|
|60 l/s||35 l/s|
What factors influence the measured flow rate of an extractor fan?
A number of different variables influence the measured flow rate of an installed extract fan including:
- The declared flow rate of the individual model of fan installed (as tested under factory
- conditions). As an example; lower powered fans with reduced flow rates are typically installed in WCs and bathrooms in comparison to those installed within kitchens.
- Axial vs’s centrifugal fans. Axial fans typically have a lower flow rate and are designed for ‘through the wall’ applications. Centrifugal fans on the other hand are capable of moving exhaust air over greater distances such as ducting runs.
- Ducting distances and layout. Ducting runs should be designed to minimise the resistance that the exhausted air will experience. This is achieved by ensuing that bends are minimised and gradual and that overall ductwork length is kept to a minimum.
- Ducting type. Rigid ducting should be used wherever possible .If flexible ducting is used, it is vital to ensure that it is not ripped or crushed by any obstructions.
- Ducting connections. Duct work connections should be fully sealed and made using rigid connectors and jubilee clips.
- External grilles. These should be clear of any obstruction that may obstruct clear air flow.
When should I complete my Extractor Fan Flow Rate Test?
At EPS Group we are able to provide a significant discount to our fees if we are able to complete extract flow rate testing at the same time as completing an air tightness test on a dwelling as part of the final building control sign off requirements. We are however able to test any ventilation fan once it is fully installed within a property.
How can EPS Group help with Extractor Fan Flow Rate Testing?
There are many reasons to appoint EPS Group to provide your Extractor Fan Flow Rate Testing?
How can EPS Group help with Extract Fan Flow Rate Testing?
We provide a client-focused extract flow rate testing service with time allocated within our appointments to allow an opportunity for any simple unexpected remedial works to be completed in order to provide the best possible chance of achieving a pass certificate.
All of our Technicians are vastly experienced with providing ventilation testing in all types of dwellings ranging from studio flats to large scale mansions. We are able to provide extract testing as either a standalone service or as part of a wider discounted compliance package with our Air Tightness Testing.
Highly Competitive Fees with substantial discounts available when extract tests are completed at the same time as Air Leakage Tests
BPEC or NICEIC Qualified Technicians
UKAS calibrated equipment
Flexible Test Appointments
Part F Air-flow Measurement Test Report for each dwelling
Free Advice & Consultation - Our Technicians will work with you to overcome any issues that may be identified from the extract flow rate tests.
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