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If not properly vented, harmful pollutants, such as CO, NO2, and particle or chemical irritants may be released into the air. Improperly installed or maintained chimneys or other ventilation outlets can cause a backdraft of pollutants into the home. ÕâÀïÃæ£¬backdraft of pollutants ׼ȷµÄÒâ˼ÊÇʲô£¿·Òë³É¡°ÎÛȾÎïµÄ·´ÏòÆøÁ÷¡±£¿ |
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