Menu
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.
To meet Part F of the Building Regulations, MVHR systems and extractor fans in residential properties must be professionally commissioned and balanced. This ensures that the installed system delivers the correct airflow rates to each room.
A qualified engineer will balance the MVHR system by adjusting the supply and extract air valves in each room, setting the unit to deliver the required air changes. They do this by calculating the airflow rates based on the room’s size using specialised tools.
Bathroom and kitchen extractor fans must also be commissioned to receive a Part F Ventilation Certificate. The process and certificate confirm that the extract fans are working in compliance with Part F Building Regulations.
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.