Goal of the study was to investigate the relation between the level of ventilation and the performance of school children in classrooms In one school in two classrooms the same ventilation system was installed. The two classrooms were located at the same facade. The system had a possibility of supplying full outside air to the classroom or the position with full recirculation of air. The temperature in the classroom was kept as constant as possible. The performance of two groups in the age of about 12 years was studied. The pupils had to carry out four different tests: 1. comparing symbols 2. the position of the legs of the clock 3. spelling language 4. calculation The weeks before the real test the pupils already had carried out the same type of test to overcome the effect of adaptation to these type of tests. The average CO_2 concentration at the beginning of the tests was approximately: 5. conditioned classroom 738 ppm 6. unconditioned classroom 1267 ppm The average CO_2 concentration at the end of the tests was approximately: 7. conditioned classroom 747 ppm 8. unconditioned classroom 1870 ppm The results of the tests are roughly that no significant effect was found for the more visual related tests such as comparing symbols and the legs of the clock. For the more cognitive tasks such as spelling and calculation significant effects were found. The improvement in relative score for the tests made under CO_2 controlled conditions was in the order of about 15%.
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