Earlier quoted context omitted.
In the UK, trickle vents above windows and doors were historically used for passive ventilation to prevent mould by allowing airflow. However, modern building practices and regulations, including stringent air tightness requirements mandated by Building Control, have shifted focus towards more efficient ventilation solutions like Mechanical Ventilation with Heat Recovery (MVHR) systems. While trickle vents are still…
Possibly, my flat was built 3 years ago and has trickle vents all over.
Cheaper option than MVHR but notably worse. Missed opportunity.