Guidebook No. 11

Air Filtration in HVAC Systems

Authors: Riccardo Romanò, Romano Alberto Basso, Alain Ginestet, Jan Andersson, Jan Gustavsson, Marko Hyttinen, Paolo Tronville, Christian Rossi

The requirement for air purity has increased by virtue of the heightened awareness of indoor air quality. Air filtration has the potential to reduce the transport of outdoor pollutants to the indoor air and to improve the health and comfort of occupants. The scope of this Air Filtration Guidebook is to increase the awareness of the role of air filtration in improving indoor air quality. It will help designers and users to understand the background and criteria for air filtration, how to select air filters and avoid problems associated with hygiene and other considerations in the operation of air filters. The Guidebook is mainly applicable to air filters in general ventilation systems. However, parts of it may also be applied to any kind of forced ventilation or when air filters are used as a part of a ventilation system in critical applications to protect people, products or the environment. This Guide combines several points of view on air filtration; the authors include filter manufacturers, academics, laboratory experts, salespeople and, with this variety, it has sometimes been challenging to identify a common voice.

The writing of the Guidebook finished a few weeks before the outbreak of the COVID-19 pandemic and a chapter about this topic is missing. Nevertheless, most of the information contained in the Guidebook are applicable also to COVID-19 risk treatment once the dimension of infected particles to be captured and the allowed risk level are defined. Even though HEPA filters can practically capture all infected particles, are not applicable for the most of the existing air-conditioning systems. 

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Video presentation of Guidebook 11

"This guidebook provides a complete and easily accessible base of knowledge for anyone who is involved, one way or another, in the process of designing, selecting, operating and/or evaluating systems and components for air filtration. With a basis in understanding the importance of air cleanliness, the guidebook shows the way regarding air cleaning fundamentals, selection of filters, test methods, operational considerations, maintenance and energy considerations. It is a complete and comprehensive guide to ensuring indoor air quality by air filtration."

Lars Ekberg
Sector Manager: Real Estate Companies and Industry
CIT Energy Management AB

"HVAC systems are extremely important and, air filtration, plays a crucial role in providing (or not) the required level of air quality. This guidebook is very important to understand and appreciate the new approach to air filtration, coming from the latest ISO 16890:2018 standard for air filtration. The main and most important differences compared to the previous EN 779:2012 are basically the testing method and, more important for engineers and HVAC professionals, the possibility to select the right air filtration overall efficiency, given the outdoor pollution level and the design air quality. Furthermore, understanding air filtration after (and during) the COVID-19 pandemic, is absolutely necessary to take the right decisions and move the right steps to protect people, not only in healthcare facilities, but also in any indoor area. Outdoor air rate and air filtration can really help in keeping people safe.”

Romano Alberto Basso
Export Manager

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