Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Please note that all times are shown in the time zone of the conference. The current conference time is: 20th Sept 2021, 04:54:58pm CEST

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Session Overview
Location: Zoom room #4
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Date: Monday, 21/June/2021
10:30am - 12:00pmWorkshop 273: Ventilation rates in homes
Location: Zoom room #4
Session Chair: Yuexia Sun
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Ventilation rates in homes

Yuexia Sun

Tianjin University, China, People's Republic of

Ventilation of homes is a major determinant of public health and energy use.

From studies in Sweden (Bornehag et al., 2005) it is shown that a reduced ventilation rate in homes is a major risk factor for allergies among children. In a study of students in Tianjin University it is shown that the lower the ventilation rate in dormitories, the more allergies and infectious diseases are reported by the students (Sun et al., 2011). In cold climate it is shown that the less ventilation, the more infestation of House Dust Mites (HdM) in beds (Sundell et al., 1995). HdM is a main trigger of allergic responses. A low ventilation rate also increases the indoor concentration of pollutants from indoor sources, like formaldehyde, VOCs and SVOCs. Some of such compounds are endocrine disruptors influencing our hormonal system, and now believed to be the cause of “Modern Diseases” like asthma, allergies, diabetes, obesity, reduced sperm quality, male reproductive disorders, and neurodevelopmental disorders like ADHD, and autism (Colborn et al., 1997).

On the other hand, with development of urbanization, energy consumption for heating and air cooling system has a trend of increase. Higher ventilation means higher consumption of energy (unless heat recovery systems are used).

In this session, we would like to get input and discussion from audience on (1) how much ventilation is needed in homes; (2) What technical solutions are used today; (3) What new solutions can be used in the near future.

1:00pm - 2:30pmWorkshop 286: Analysis of deposited and airborne dust as part of detailed indoor climate audits
Location: Zoom room #4
Session Chair: Johan Mattsson
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Analysis of deposited and airborne dust as part of detailed indoor climate audits

Johan Mattsson, Kolbjørn Mohn Jenssen

Mycoteam AS, Norway

Indoor climate surveys can take place in different ways. Because there is no standardized method for either sampling, analysis or interpretation, there is a large variation in the results of the surveys. In addition to the uncertainty in how representative the results are in the current analysis, it is very difficult to compare results from different measurements. Because deposited dust reflects what has been in the hovering phase in the room air, a systematic examination of quantities and types of particles can provide a good clarification of both exposure and sources. We have developed a standardized method (Mycotape-2) for sampling and analysis of deposited dust on surfaces. We want to have a workshop on this topic where both the method and results can be presented and where there is room for professional discussion between the participants.

7:00pm - 8:30pmSeminar 330: REHVA-ISIAQ Workshop on COVID-19 transmission
Location: Zoom room #4
Session Chair: Atze Boerstra
Session Co-chair: Jarek Kurnitski
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REHVA-ISIAQ guidance on measures to prevent airborne transmission

Atze Boerstra1, Jarek Kurnitski2

1BBA Binnenmilieu, The Netherlands; 2Tallinn University of Technology, Estonia


Property owners and managers. Facility managers. HVAC service providers & contractors. Engineering consultants. Indoor climate specialists. Occupational health & safety professionals. Building authorities.


REHVA acted fast in the spring of 2020 to develop evidence-based recommendations on practical COVID-19 infection mitigation measures related to e.g. the operation and maintenance of ventilation systems. We have seen that the guidance has helped owners & operators of existing buildings to make the right kind of decisions about their buildings and building service systems throughout all over Europe and beyond.

 This joint REHVA-ISIAQ seminar focuses on the development and latest iteration of the REHVA requirements and their scientific evidence. The workshop complements the ISIAQ workshop on infection risk models that focusses on the more fundamental aspects related to airborne transmission of infectious diseases indoor.

Questions covered in this workshop are for example:

• What air exchange rates should be recommended?

• How about the relative importance of measures, e.g. air change rate versus HVAC servicing points, controlling pressure differentials between rooms and general sanitation measures (e.g. handwashing)?

• Why is humidification not generally recommended in the guidance document (the significance of relative or specific humidity)?

• Are droplet nuclei with (infectious) virus-laden aerosols transported via ventilation ducts and recirculation sections or enthalpy wheels (rotary heat exchangers) back to occupied rooms?

• How relevant are the present COVID-19 requirements in relation to other diseases e.g. seasonal flu (future influenza epidemics)?


Presentations followed by Q&A and interactive group discussion at the end.

Date: Tuesday, 22/June/2021
10:30am - 12:00pmSymposium 320: Towards Zero Infections in Health Institutions
Location: Zoom room #4
Session Chair: Clemens Bulitta
Session Co-chair: Peter Höjerback
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Symposium: Towards Zero Infections in Healthcare Facilities

Peter Ljubetic1, Mari Regner1, Clemens Bulitta2, Peter Höjerback1

1Avidicare AB; 2OTH-Weiden


You are invited to this Scientific Symposium to meet some of the most prominent researchers and experts within Infection Prevention and Ventilation of the surgical suite. The Symposium is specifically developed for you as Clinical Engineer, Infection Preventionist, Perioperative Nurse, Architect or Healthcare Executive, as well as other Healthcare Professionals and Researchers.


The current pandemic, along with continuously very high costs in both lives and money from surgical site infections, have made it obvious that improved air management is needed to cope with airborne infections. It is no longer enough to just focus on hand hygiene, cleaning and disinfection as the main tools for infection prevention. There clearly is a need to come up with innovative concepts and solutions for air management and ventilation, especially inside healthcare facilities. Healthcare authorities, HVAC manufacturers, infection prevention experts and building engineers will need to come together and focus on airflow optimization through changes to existing ventilation systems, novel air-purification and decontamination technologies as well as better airflow management.

 In this Symposium you will meet both researchers from top universities and healthcare professionals from top orthopedic clinics in Europe who will introduce you to the latest insights for infection prevention, including the rationale behind and features of a modern and robust technology called Temperature-controlled airflow. The focus of the symposium will be on the most demanding area of any hospital – the surgical suite with its operating rooms.

 The Symposium is sponsored by Avidicare AB. The company was founded in 2007 and currently has more than 250 installations of its unique Opragon ventilation system. Together with its partners, the company works “Towards Zero Infections” in healthcare facilities.


Each presentation will be followed by a Q&A session where you can ask your questions directly to the speakers.

1:00pm - 2:30pmSeminar 114: Use of Infection Risk Calculators to Manage Building Occupancy Post-COVID
Location: Zoom room #4
Session Chair: Brad Prezant
Session Co-chair: Lidia Morawska
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SPEAKERS: Lidia Morawska, Brad Prezant, Giorgio Buonanno (See the PDF below for detailed programme)
Zoom room #4 

Use of Infection Risk Calculators to Manage Building Occupancy Post-COVID

Brad Prezant1, Lidia Morawska2, Giorgio Buonanno3

1VA Sciences, Australia; 2QUT; 3University of Cassino and Southern Lazio, Italy

An ISIAQ seminar led by Professor Morawska will present, describe, and discuss 12 infection risk calculators.

This workshop is intended to provide users of these calculators to demonstrate the utility of these calculators across different occupancy types. Authors and/or users of these calculators will present the experiences and outcomes of the application of these calculators to solving building occupancy issues.

How have these calculators assisted in re-occupying buildings post-COVID?

Have they been adopted as valid indicators of risk by cognisant public health authorities across various countries?

Has real-world experience suggested that the infection risk estimates provided are valid?

Are there ways that these calculators can be improved?

Can we learn from this application of research to practice in ways that would assist better management of other indoor air quality issues?

7:00pm - 8:30pmSeminar 225: Inspection and commissioning of ventilation systems, including VAV-systems
Location: Zoom room #4
Session Chair: Lars Ekberg
Session Co-chair: Peter G. Schild
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Inspection and commissioning of ventilation systems, including VAV-systems

Lars Ekberg1, Peter Schild2, Risto Kosonen3

1Chalmers Univ. of Tech. & CIT Energy Management, Sweden; 2Oslo Metropolitan University; 3Aalto University, Finland

The workshop may be held as a seminar with presentations from 3 experienced professionals. The Nordic Ventilation Group (NVG) may stand as organizer. The workshop will be planned in detail by a sub-group of NVG members.

Target group: Practitioners and researchers who need an update/overview about inspection and function testing of ventilation systems. Professionals working with design, construction and/operation of ventilatios systems.

Issues addressed:

1.Functional requirements, as a basis for inspection

- Expected/required function

- Observations (ocular and by measurement)

- Criteria for acceptance

2. Practical methods to document of proper function

- Measurement methods, instruments and devices

(pressure differential, air velocity and air flow rate)

- Accessibility

- System in the correct state of operation

3. Modern challenges

- Demand Controlled Ventilation: Handover tests and functional testing

- Understanding the principle of control of VAV systems

- Sensor quality, precision, placement etc.

After each presentation there will be time allocated for questions and discussions, which will be documented.

Date: Wednesday, 23/June/2021
10:30am - 12:00pmSeminar 331: Ventilation and IAQ criteria in EN 16798-1 revision
Location: Zoom room #4
Session Chair: Jarek Kurnitski
Session Co-chair: Pawel Wargocki
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SPEAKERS: Bjarne Olesen, Jarek Kurnitski, Peter G. Schild, Pawel Wargocki (See the PDF below for detailed programme)
Zoom room #4 

Ventilation and IAQ criteria in EN 16798-1 revision

Jarek Kurnitski1, Bjarne W. Olesen2, Pawel Wargocki2

1Tallinn University of Technology, Estonia; 2Technical University of Denmark


Researchers, HVAC professionals and consultants, building authorities


EN 16798-1 serves as a major indoor climate standard with the aim to specify main design criteria for buildings with human occupancy. This workshop is limited to IAQ and ventilation, other areas of indoor climate are not discussed. In the current standard, IAQ is mainly dealt through perceived air quality that leads to ventilation sizing criteria in non-residential and residential buildings. In addition, health-based ventilation criteria is provided based on WHO listed pollutants. Revision of the standard provides a good opportunity to include and develop another evidence-based criteria being based on health effects, productivity and learning performance, sick leaves and infection risk.

The objective of the workshop is to discuss new ventilation criteria and propose directions how to develop input to the revision of the standard. The following questions will be discussed:

• That is the state of health-based ventilation criteria including non-specific pollutants, CO2 and evidence from epidemiological studies? It has been generally seen that the lack of health-based ventilation criteria has been a barrier for authorities to set more demanding ventilation requirements in many countries.

• Productivity in office work and learning performance in schools has been widely studied. Could these results be utilised as one criterion for Category II and I ventilation rates?

• COVID-19 pandemic has brought out the importance of the infection risk control in indoor spaces. The phenomena is not new because there is good previous evidence and knowledge on sick leaves (common cold) and influenza. As any airborne virus can be described by emission rates, the question is, should ventilation criteria include ventilation sizing to some predefined infection risk probability.


Presentations with Q&A

1:00pm - 2:30pmSeminar 340: New understandings of “unclear” building related complaints and experiences
Location: Zoom room #4
Session Chair: Jan Vilis Haanes
Session Co-chair: Steven Nordin
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New understandings of “unclear” building related complaints and experiences

Jan V. Haanes1, Steven Nordin2

1University Hospital of North Norway (UNN), Norway; 2Umeå University, Sweden


All who work with buildings and people, irrespective of professional and scientific vs. practical background.


Most work in the field of healthy buildings relies heavily on information reported by humans. Often people have complaints or other experiences that professionals find difficult to interpret or understand, sometimes also contrary to common knowledge. This may cause frustration and conflicts. “Sick building syndrome”, “multiple chemical sensitivities” and “electromagnetic hypersensitivity” are examples of terms used for what may be seen as the “oddest” conditions. However, also more common building related complaints and other experiences are often regarded as “unclear”. In this seminar, we will address new understandings of possible underlying mechanisms – from different views. This new knowledge may be of substantial help for professionals in their understanding, interpretation, handling and actions.


The two presentations in the seminar are briefly introduced in session 11. The full papers are available as PDFs at the web site of session 11. At session 11, Nordin and Haanes also present one other paper each. Attending these presentations/ reading the papers will give important background for seminar 340.


Introduction, two presentations and general discussion facilitated by chairs.



Lenght: 5 minutes

Introduction, aims of the symposium. Presentation of spectre from BRI (building related illness) to “SBS” (sick building syndrome) etc. I.e. from likely building related in a traditional meaning (causality) to symptoms associated with buildings (SAEF-buildings)

PRESENTER: Steven Nordin

Lenght: 20 minutes

Presentation: Possible mechanisms underlying non-specific building-related symptoms


Lenght: 20 minutes

Presentation: Understanding “Symptoms Associated with Environmental Factors” (SAEF) in buildings; e.g. “sick building syndrome”, “electromagnetic hypersensitivity” and “multiple chemical sensitivity”

PRESENTER: Steven Nordin

Lenght: 45 minutes

General discussion

Total lenght 90 minutes


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