The goal of this project was to improve the quality of indoor air in a multistoried residential builing of 81 flats built in 1960. The building is located in a heavily built urban area of Helsinki. The building had a mechanical exahust ventilative system without outdoor air inlets. A questionnaire was sent to occupants and a condition survey was made prior to renovation. the main indoor climate problem was draught with a prevalence of 60
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