The periodically opening of windows feature in the calculator is apparently not working.
http://cara.web.cern.ch/calculator-cern?infected_people=1&location_name=Geneva%2C+CHE&location_latitude=46.20833&location_longitude=6.14275&opening_distance=0.8&event_month=February&room_number=czaf&room_volume=100.0&simulation_name=d%C3%A9ea&total_people=11&ventilation_type=natural_ventilation&virus_type=SARS_CoV_2_OMICRON&volume_type=room_volume_explicit&windows_duration=10.0&windows_frequency=60.0&window_height=1.6&windows_number=1&window_opening_regime=windows_open_periodically