U novim zgradama prema Tehničkom propisu o racionalnoj uporabi energije i toplinskoj zaštiti u zgradama NN (128/15) zrakopropusnost za zgrade bez mehaničkog uređaja za provjetravanje ne smije biti veći od 3,0 h-1, odnosno ne veći od 1,5 h-1 za zgrade koje imaju mehanički uređaj za provjetravanje. Ispitivanje se provodi prije tehničkog pregleda zgrade. Razlog tome leži u smanjenju potrebne toplinske energije za grijanje i hlađenje zgrade ali i poboljšanju toplinske ugode. Važnu ulogu u definiranju toplinske ugode ima i unutarnja kvaliteta zraka, odnosno koncentracija CO2, relativna vlažnost i temperature. U radu su prikazani rezultati mjerenja zrakopropusnosti u trima učionicama OŠ Vladimir Nazor Čepin te rezultati ispitivanja unutarnje kvalitete zraka – razine ugljičnog dioksida, relativne vlažnosti zraka i temperature. Cilj ovog istraživanja je vidjeti postoji li korelacija između zrakopropusnosti zgrade i unutarnje kvalitete zraka, te prikazati uvjete u kojim uvjetima se provodi nastava u Osnovnoj školi Vladimira Nazora u Čepinu.

In newly designed buildings, where the Technical regulation related to rational use of energy and thermal protection in buildings NN (128/15) states that airtightness should not exceed 3.0 h-1 in buildings without a mechanical ventilation system or 1.5 h-1 in buildings equipped with a mechanical ventilation system. The examination is carried out before the technical inspection of the building. The reason for this is the reduction of required heat energy for heating and cooling the building and increased thermal comfort. Indoor air quality, namely the concentration of CO2, relative humidity and temperature, also plays an important role in defining heat comfort. This research presents the results of the measurement airtightness in three classrooms of Vladimir Nazor Primary School in Čepin and the results of the examination of indoor air quality – the level of carbon dioxide, relative humidity and temperature. The aim of this research is to investigate the conditions in which the classes at Vladimir Nazor Primary School in Čepin are being held and to establish any potential correlation between the airtightness of the building and its indoor air quality. K