14/10/2026
Heat recovery ventilation removes pollen, dust and particulates as standard. What it does not remove on its own is the gases coming off the traffic.
This flat is on a busy central London street, and clean air was the reason the owner wanted the system at all. So a second carbon filter was added to the supply side, before the air reaches any room in the flat.
If the road outside is why you are considering ventilation, that second stage is the thing to ask about.