You know why good ventilation is important. But do you have enough ventilation already? Do you need a new extractor fan? We know that good home ventilation prevents mould and rot, improves quality of life, and removes smells. You’ve probably already got extractor fans installed – if not, then our “how much ventilation is enough” article is a good place to start. But extractor fans deteriorate over time. The outlet fills with fluff. The external vent may become blocked by insects and birds. The duct may get damaged. The fan may start to wear out. So how can you tell? How do you know if your extractor fan is working as it should? In the UK, the government have published guidance on how to test extractor fans. If you are in a new-build house, you should have got a PEATA airflow test certificate when you bought the house. If you did, then you should get in touch with the company who performed the test and ask them to come back and re-test your fans (there will usually be a charge for this). If you don’t have a PEATA airflow test certificate, then you can search for a PEATA-Registered company to come and do the test for you. If you can’t find a company local to you, please let us know and we’ll put you in touch with someone.