## 8 Conclusions and Future Work
[24] when assessing several optimal ventilation strategies for a school in Saudi Arabia, in order to minimize the risk of the transmission of airborne viral infections indoors. In summary, our study provides significant contributions in terms of understanding the application and constraints of decentralized ventilation systems in the retrofitting process of educational facilities. Although there are certain challenges associated with humidity control and noise management at higher operational levels, the overall advantages of these systems in terms of air quality, installation convenience, occupant satisfaction, and energy efficiency establish them as a feasible and efficient solution for enhancing indoor environmental quality in educational settings. Limitations of the current study include its focus on a limited number of schools, potentially limiting the generalizability of the findings. Also, the study primarily concentrates on physical measurements of IEQ parameters without delving deeply into subjective perceptions or health outcomes of students and teachers, which could be addressed in future research. Future studies should consider longitudinal approaches, observing the long-term impacts of decentralized ventilation systems over various seasons and years. This extended timeframe would enable a deeper understanding of the consistency and sustainability of these systems in enhancing IEQ. Expanding the scope to encompass a broader range of schools across different geographical and socio-economic spectrums within Romania is recommended. Such diversity in the study sample would shed light on the influence of external environmental factors and socio-economic conditions on IEQ. Investigating the direct relationship between enhanced IEQ and educational outcomes, such as student academic performance, attendance, and health, is crucial. This would establish a more concrete link between environmental quality within schools and tangible educational benefits. Future research should adopt a more holistic approach to IEQ, examining the combined effects of various IEQ components (air quality, thermal comfort, lighting, and acoustics) and their collective impact on occupants' health and the learning environment. Conceptualization, T.C. and A.D.; methodology, T.C. ; validation, T.C., A.D. and A.V. ; formal analysis, T.C. ; investigation, T.C., A.D. and A.V. ; resources, T.C. ; data curation, T.C. ; writing--original draft preparation, T.C., A.D. and A.V. ; writing--review and editing, T.C. ; visualization, T.C. and A.V. ; supervision, T.C. ; project administration, T.C. ; funding acquisition, T.C. All authors have read and agreed to the published version of the manuscript. This work was supported by National Research Grants of the UTCB (ARUT 2023), project number UTCB-31 and Crnfs-FDI-2023-F-0655. Not applicable. The data presented in this study are available in the article. We acknowledge the help all the partners and collaborators from this unique project in Romania--Healthy School Project [[https://scolisanatoase.ro/](https://scolisanatoase.ro/)]([https://scolisanatoase.ro/](https://scolisanatoase.ro/)) accessed on 1 October 2023. The authors declare no conflict of interest.