On both commercial and residential projects bathroom, toilet, laundry and kitchen are key areas requiring ventilation. This is becoming more frequent in recent times as many new buildings, especially in the commercial sector, are now constructed with fixed window placement. With this design feature there are a number of different regulations to take into account within the New Zealand Building Code.

With ductwork, fans and filtration systems fresh air can be transferred, smells can be extracted and heat can be moved from one area to another. A well-ducted ventilation system is therefore paramount in providing a comfortable and healthy interior environment.