Pressure-controlled trickle vents

Pressure-controlled trickle vents are devices fitted to windows that allow a controlled flow of air between the inside and outside of a building.

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OKNOPLAST pressure-controlled trickle vents. Fresh air with your windows closed
Airtight windows help reduce heat loss, but your home also needs adequate ventilation. Pressure-controlled trickle vents allow outside air into your home without opening the windows, supporting everyday background ventilation.

How do pressure-controlled trickle vents work?
Fitted to your windows, these vents regulate incoming airflow in response to differences in air pressure between indoors and outdoors. As the pressure difference increases, the mechanism restricts airflow, helping to limit excessive ventilation and draughts.