HRV and ERV
Choosing between an HRV and an ERV
...at any rate, the intent is to ensure around 0.3 ACH, which is the international norm to evaluate ventilation systems.
How much fresh air comes in through walls?
A reasonably tight house would have a measured air tightness of about 3 Air Changes per Hour at a pressure of 50 pascals (ACH @ 50 Pa).
For the average h...