HOW AIR EXCHANGE WORKS
The air in your home will be completely replaced by bringing in fresh air from outside and removing pollutants and stale air from inside, all the while filtering, purifying and reducing excess humidity.
EVEN LEAVING THE WINDOWS OPEN in summer isn't that effective. But there's more to an air exchanger than simply changing the air. It reduces excess humidity by expelling moisture-filled air outdoors several times a day. This can help eliminate mould and bacteria-friendly environments, make unpleasant odours disappear and protect buildings from humidity-related damage.
Here is two images that demonstrate the air exchange concept:
Appropriate operation of the units inside the house
The installation may differ from one unit or home to another.