Had 2 vents installed for some time (currenlty I'm at three).
One pushing fresh air to thge bed room, one pulling bad air (smoke) from my office. Roughly 70 m³/h at full speed of the fans in and out.
Added a vent pulling from a small toillet room.
Also added filters to the vents to keep the ducts clean.
Total air pulled is reduced now to around 50 m³/h. I think the filters cost a lot. Will change the way they are done. Currently they are flat of the size of the vent. Think I'll have to change them to a cone shaped filter to have more surface and allow for more air flow.
Also will continue to add more vents.
Update: Changed first filter to a cone shaped one and I'm back to 60 m³/h
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