Part F Ventilation Certificates are issued for Building Control sign-off immediately after MVHR Commissioning and Extractor Fan Testing process has been completed. Prices start from £80 per certificate. Discounts offered on multiple systems.
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.
A technician will carry out checks to confirm if the ventilation system has been installed according to the design. The boost switches, humidity and temperature sensors will be tested. The spacing under the doors of the property will also be inspected. The airflow rates are measured with a calibrated vane anemometer to ensure the right volume of air circulates and does not get trapped in the room leaving it to stagnate become stale making the room smell musty. The air vents in the ceiling and the speed settings are adjusted to allow the right rooms to get the right airflow rates. The resident should notice an improvement in air quality after this process has been completed. An overall fresh feeling.
Bathroom/ensuite, utility and kitchen extractor fans must also be checked and tested before a Part F Ventilation Certificate can be issued. This ensures the installation of the system is correct, it works according to the design also preventing condensation and damp issues on the ceilings and walls of the property from forming. Most extractor fans are poorly installed and are never set up to work optimally. Extractor Fan testing will uncover these potential issues.
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. Here’s some great insights for Servicing Your MVHR System.
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