CleanScreen purifies the polluted air by using the air currents that you always find around roads. These come from atmospheric wind and/or the sideways-directed slipstream from passing traffic. The polluted air flows through the front wall and then the specially designed filters, exiting the screen at the top. Even when the wind comes from the other side of the screen, a sideways-flowing air current is generated by underpressure.
The process of air purification is as follows:
- The polluted air first comes into contact with the front wall, which is made of pumice coated with titanium dioxide (TiO2). The titanium dioxide ensures the preliminary filtration of particulates and converts harmful nitrous oxides (NOx) into harmless nitrate (NO3).
- The polluted air then enters the space between the front and rear walls. In this space, the air flows past and through two filters. The first filter consists of a cloth made from the electrostatic material known as electret. The second is a High Air Flow (HAF) filter with a honeycomb structure. Like the particulate material itself, the two filters have an electrostatic charge. This causes the particles to cling to the filter. Once the air has flowed through the filters, the air is purified of both particulates and nitrous (di)oxides.
- The purified air eventually exits the screen at the top, thereby contributing to a healthier living environment.