Glazpart 4000 Trickle Vents 380mm x 18.5mm (Internal & External)

4000 Trickle Vents are high-performance window ventilators engineered to deliver approximately 4000 mm² Equivalent Area (EA) for controlled background ventilation — a key metric used to quantify effective airflow through a ventilator slot under standard conditions. This level of EA supports compliance with UK Building Regulations Part F for background ventilation in habitable spaces and helps manage moisture, reduce condensation, and improve indoor air quality.

Designed for seamless integration into uPVC, aluminium, and timber window systems, 4000 EA vents feature a slimline, low-profile design that maintains thermal performance and aesthetics while ensuring reliable airflow. Many models also offer acoustic performance around ~33–35 dB (closed) and are tested to standards such as BS EN 13141-1 for watertightness and performance.