A group of 18 identical well-insulated experimental houses in Sweden, utilizing a user controlled exhaust fan ventilation system, was monitored during 1985- 1986. The ventilation rate can be controlled by the user by adjusting the fan speed with a conveniently located three-way switch. No heat recovery is provided for, the idea being that the average ventilation rate will be low, thereby saving energy. The houses are described. The results from measurements of ventilation efficiency, ventilation rates. run time of fan speeds and energy consumption are presented.
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