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This report is a deliverable from IEA-EBC Annex 78 “Supplementing Ventilation with Gas-phase Air Cleaning, Implementation and Energy Implications”. Annex 78 also looked at a new test method for gas-phase air cleaning technologies, how gas-phase air cleaning technologies may partly substitute for outside air, the energy impact of using air cleaners to improve indoor air quality and the long-term performance of gas-phase air cleaners.

Worldwide, there is an increasing number of publications related to air cleaning and there is also an increasing sale of gas phase air cleaning products. This puts a demand for verifying the influence of using air cleaning on indoor air quality, comfort, well-being and health. It is thus important to learn whether air cleaning can supplement ventilation with respect to improving air quality i.e. whether it can partly substitute the ventilation rates required by standards.

An ideal ventilation system should be robust and capable of providing thermal comfort and good indoor air quality (IAQ) that safeguards occupant health while also minimising space conditioning costs and reducing auxiliary energy use for fans.

AIVC's Ventilation Information Paper #48.4 summarizes current knowledge on trends in building ventilation requirements and inspection in Italy. 

AIVC's Ventilation Information Paper #48.3 summarizes current knowledge on trends in building ventilation requirements and inspection in Ireland. 

The Book of Proceedings of the 44^th AIVC - 12^th TightVent - 10^th venticool  Conference "Retrofitting the Building Stock: Challenges and Opportunities for Indoor Environmental Quality", held in Dublin, Ireland on 9-10 October 2024.

The Presentations the 44^th AIVC - 12^th TightVent - 10^th venticool  Conference "Retrofitting the Building Stock: Challenges and Opportunities for Indoor Environmental Quality", held in Dublin, Ireland on 9-10 October 2024.

Buildings account for a substantial portion of global energy consumption, and heating, ventilation and air conditioning (HVAC) systems are responsible for approximately 40% of the buildings’ energy consumption. A building façade, with HVAC, has a great influence on the internal environment. An optimization of the façade design and operation can help improve building energy efficiency.

Following the pandemic of Covid-19, the scientific interest in ventilation rate of buildings, and especially in spaces with high occupancy, has increased. The creation of a healthy and acceptable internal environment, especially at workplaces is considered necessary, both to deal with the sick building syndrome, or the spread of various diseases, as well as to improve the comfort of employees.

Noticeably higher concentrations of gaseous pollutants were measured in bedrooms than living rooms, and in winter than summer, where p-values were found to be of a stringent significance (average p = 0.008). PM2.5 concentrations were found to be exceeding the WHO 24-h average threshold of 15 µg/m3 in kitchens for the week-long monitoring time (92% in winter, 51% in summer).