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一户五口之家、120平米、三室两厅的房子,层高3m。可根据“换气次数法”确定新风量。室内新风换气次数为0.7~1次/h, 该住宅的新风量=室内面积×层高×新风换气次数,所需新风量为252~360立方/小时,可选择一台LX300型新风机。