When is it advisable to ventilate a workspace?

Optimize ventilation thanks to air quality monitoring

Ventilation is the fundamental mechanism for ensuring healthy air in the office, but the concept goes far beyond the simple act of opening a window. Proper air renewal consists of replacing indoor air, laden with pollutants generated by human activity and the building materials themselves, with cleaner outdoor air. However, this task, which seems simple, requires a well-defined strategy to be truly effective and efficient, as set out in regulations such as the Technical Building Code (CTE).

Natural ventilation has its limitations: it can be insufficient on windless days, counterproductive in areas with high outdoor pollution, or a source of energy waste in extreme climates. For this reason, modern office buildings rely on controlled mechanical ventilation (CMV) systems. These systems not only bring in outside air, but also, crucially, filter it to remove particles and pollutants before it reaches the workspaces. In addition, systems with heat recovery units allow the new air to be tempered using energy from the extracted air, minimising heating or cooling costs.

But how do you know when and how much to ventilate? The answer lies in the data. The only way to optimally manage air renewal is through real-time monitoring. Installing sensors that measure key parameters such as CO2—the best indicator of occupancy and poor ventilation—allows systems to be automated so that they only operate when necessary. This ensures compliance with regulations and protects the health of employees, while avoiding excessive energy consumption, thus aligning people's well-being with the sustainability of the building.