Accomodation Ventilation

We extract the air from rooms to create underpressure and thus ensure that fresh (new) air flows into the room.
There are two types of system for this: the extraction from dry and from wet areas.

By extracting air from dry rooms, we can stop the air in the rooms from becoming musty (consider perspiration, the smell of smoke and other smells). Extracting air from wet rooms removes the moist air and smells (consider toilet areas).

The fresh (new) air can be brought into the room untreated or treated (cooled or heated).