Window trickle vent

Ventsys window trickle vents ensure air inflow into living spaces. Buildings built on the natural ventilation principle need to have 2 components for ventilation to work. 1 - Vent where air will leave the premises. 2 - Air from where will enter the premises. The majority of buildings on natural ventilation relied on air to enter living spaces through old and not isolated windows. After replacing to new windows airflow has stopped. Thats where Ventsys trickle vents can help. Ventsys trickle vents don't require any milling or drilling into window frames, so the window's mechanical properties aren't damaged. It's easy to install on almost all opening windows so any person can do it. The outside cassette is equipped with M5 filters, which can filter out dust and other substances into entering the living space. Fits almost all opening windows, including wood, PVC and aluminum.