For new buildings and when the HVAC system of an existing building is fully renovated, the fresh air flow rate for an office at CERN is set at 50 m3/h per occupant. This value complies with the most recent directives on indoor air quality. For energy efficiency reasons, the ventilation system must be capable of adjusting the flow rate according to the number of occupants.

At CERN, the recommended temperature in an office in winter is between 20°C and 22°C.

With the exception of pregnant workers, there are no provisions preventing office work in high temperatures. Nevertheless, the Organization must take the necessary measures to guarantee the health and safety of personnel in conditions of extreme temperatures. These measures are implemented in accordance with the heatwave action plan – https://hse.cern/hwap

Yes, the air in the workplace can be recirculated using natural means, provided that the openings in the premises are permanent. According to the applicable rules, windows are not considered as a means of natural ventilation unless they have one or more permanent openings (e.g. on their aluminium frame).