UBLO is a circular vent designed to be installed in specially designed insulated fixed glazing. Its lid allows for easy opening and closing, providing continuous, efficient ventilation while maintaining clear visibility. This solution enables fresh air to enter indoor spaces without the need for costly and complex building modifications, such as installing operable frames. By reducing the need for frames and simplifying components, UBLO helps lower both embodied and operational carbon emissions, creating energy-efficient windows. The small opening is designed to be safe, with no risk of falls or intrusion, ensuring consistent ventilation. Users can request their own aperture placement and frame style, and UBLO can even customise the lids with features such as artwork, plant pots or lighting fixtures.