Positive pressure Zehnder system – GreenBuildingAdvisor

Hi, I have a Zehnder Q600 ERV. I never got the whole system commissioned because we installed it during COVID, and the Zehnder rep said they couldn’t cross the border…

Anywho it is set to basic balance all this time, but with the wildfires I realized our in home pm2.5 was getting very similar to the outside, which I thought could be mitigated by having an ERV system.

So I looked and found the imbalance feature. The documentation in Zehnder seems odd, but I essentially set it to having 10% less exhaust fan and intake fan. In my mind, this filters the air in a controlled fashion via the Q600, and keeps diffusion of exterior air into the house but letting the interior air to diffuse out. (oddly Zehnder calls this “under pressure” in the manual).

Was wondering, if others have looked at this setting and if 10% is a reasonable number?

Thanks,