The housing corporation’s apartments from the 1950s are overdue for renovation. Wall cavities are being improved and window frames are being replaced. With a combination of measures, a huge jump in energy label designations and grant levels is achievable. You don’t want to use the central ventilation channels because asbestos removal must be done there.
The illustration shows a residence in which the Fresh-r ventilates damp air away from the sanitary spaces, and brings fresh air to the living room and bedrooms with Forwards.