Provides a summary of Report IIIa of the overall research project `air change in buildings' undertaken by the EMPA, Switzerland, sponsored by the Swiss Federal Ministry for Environmental Protection. Describes an investigation ontwo identical insulated flats in the same block with the same orientation, one with folding shutters and the other with roller blinds. The occupants were instructed on how to close the blinds at night. Their normal living habits and ventilation preferences were not affected. Illustrates the flats and blinds diagrammatically and in photographs.
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