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Part F Commissioning Certificates are issued for Building Control sign-off after MVHR Commissioning and Bathroom Extractor Fan Testing.
Bathroom fans should extract a minimum of 15l/s intermittently, and kitchen and utility fans should extract a minimum of 30l/s. These extractor fans should run for a minimum of 15 minutes.
MEV fans should continuously extract 13l/s from the kitchen and 8l/s from the bathroom and ensuite. Ensure the trickle vents above the windows are occasionally opened to introduce 'make-up air.'
The property's rooms should experience the correct number of air changes, which is 0.5 on boost mode. If Part O is part of the design strategy, then you would need to set up the purge airflows.
MVHR systems should be balanced and commissioned by an engineer who understands how to adjust the supply and extract air valves in the property’s rooms and change the settings on the MVHR unit to allow the system to deliver the correct air changes.
Airflow rates are usually calculated using the area size of each room. The airflows should be measured with a UKAS-calibrated anemometer. After the ventilation system is commissioned, a commissioning certificate for Part F Building Regulation compliance must be issued. The commissioning engineer’s details, airflow meter information, and MVHR unit supply and extract settings must also be included on the certificate
Our fee for commissioning an MVHR system starts from £385. We offer discounts for multiple MVHR systems and bathroom extractor fan property commissions.
You can download a copy of the building regulations here (download)
1. Do you have the correct airflow rate minimum requirements for the property?
2. Is the ventilation system 100% complete, and does it power up when you turn on the switch?
3. If it’s an MVHR system that is going to be commissioned, has the condensate drainage pipe been fitted on the correct side of the unit?
4. Is the property clean, and is the MVHR unit accessible?
5. Is there access to the air valves in the various rooms?
6. Are the boost switches in place, and have the external air vents been fitted?
After commissioning your MVHR system you should ensure that you service your system regularly. Click here to learn more about MVHR servicing
Studio 7, Richmond Road Studios, 119 Richmond Road, Kingston Upon Thames, KT2 5BX.