Why do I not need tricklevents in all the rooms and why only 4,000mm² in dry rooms?
A. The objective of a Passivent system is to create planned air routes from dry rooms to wet rooms with extraction directly from wet rooms to the outside. By looking at the whole house, i.e. background and extract ventilation together, rather than only a single element, it is possible to provide a combined approach. The BBA certificate provides an acceptable alternative to meeting Building Regulations for both background and extract ventilation. As a result, if a Passivent whole house system is installed, background ventilation is not installed in wet rooms and only 4,000mm² is required in dry rooms. Q.
