Figure 2. Illustration of how an infected person (on the right) leads to aerosol exposure
(red spikes) in the breathing zone of another person
1. Provide adequate ventilation of spaces with outdoor air
2. Switch ventilation on at nominal speed at least 2 hours before the building opening time and set
it to lower speed 2 hours after the building usage time
3. At nights and weekends, do not switch ventilation off, but keep systems running at a lower speed
4. Open windows regularly (even in mechanically ventilated buildings)
5. Keep toilet ventilation in operation 24/7
6. Avoid open windows in toilets to maintain the right direction of ventilation
7. Instruct building occupants to flush toilets with closed lid
8. Switch air handling units with recirculation to 100% outdoor air
9. Inspect heat recovery equipment to be sure that leakages are under control
10. Adjust fan coil settings to operate so that fans are continuously on
11. Do not change heating, cooling and possible humidification setpoints
12. Carry out scheduled duct cleaning as normal (additional cleaning is not required)
13. Replace central outdoor air and extract air filters as normal, according to the maintenance
schedule
14. Regular filter replacement and maintenance works shall be performed with common protective
measures including respiratory protection
15. Introduce an IAQ sensor network that allows occupants and facility managers to monitor that
ventilation is operating adequately.
COVID-19 Task Force of REHVA’s Technology and Research Committee
Prof. Jarek Kurnitski, Chair of REHVA COVID-19 Task Force, Tallinn University of Technology, Chair of REHVA Technology and Research Committee
Dr. Atze Boerstra, REHVA vice-president, managing director bba binnenmilieu
Dr. Francesco Franchimon, managing director Franchimon ICM
Igor Sikonczyk, Senior Technical and Regulatory Affairs Manager at Eurovent
Ir. Froukje van Dijken, healthy building specialist at bba binnenmilieu
Prof. Catalin Lungu, REHVA vice-president, vice-president of AIIR
Prof. Guangyu Cao, Norwegian University of Science and Technology (NTNU)
Dr. Hywel Davies, Technical Director of CIBSE
Prof. em. Olli Seppänen, Aalto University
Frank Hovorka, REHVA president, director technology and innovation FPI, Paris
Jaap Hogeling, manager International Projects at ISSO
Prof. Ivo Martinac, REHVA vice-president, KTH Royal Institute of Technology
Prof. Livio Mazzarella, Milan Polytechnic University
Prof. em. Francis Allard, La Rochelle University
Henk Kranenberg, vice-president of Eurovent, Senior Manager at Daikin Europe NV
Mikael Borjesson, Vice President of Eurovent Association, Competence Director Swegon Group
Francesco Scuderi, Deputy Secretary General at Eurovent Association
Prof. Dr. Marija S. Todorovic, University of Belgrade Serbia
Dr. Benoit Sicre, Lucerne School of Engineering and Architecture
Prof. Manuel Gameiro da Silva, REHVA vice-president, University of Coimbra
Dr. Kemal Gani Bayraktar, REHVA vice-president, president of TTMD
Juan Travesi Cabetas, REHVA vice-president, vice-president of ATECYR
Prof. Manuel Ruiz de Adana, ATECYR Technical Committee. University of Cordoba
Prof. Pedro G. Vicente Quiles, Chair of ATECYR Technical Committee. Universidad Miguel Hernández de Elche
Prof. Cristina Tanasa, Politehnica University Timisoara
Ioan Silviu Dobosi, AIIR - Romanian Association of Building Services Engineers
