Trickle ventilation refers to a method of providing background ventilation in buildings through small openings, typically incorporated into windows or walls. This system allows a controlled amount of fresh air to enter, promoting air circulation and reducing humidity levels.
In the context of UK house building, while building regulations require adequate background ventilation to ensure indoor air quality and reduce condensation, they do not specifically mandate the use of trickle vents. Continuous mechanical extract ventilation (CMV) is often considered a more effective alternative, providing superior air quality and moisture control. Trickle vents are, however, commonly used in new builds to complement other ventilation strategies.